Fix comment style

Fix comment style to `//`, because other than the initial attribution comment, [we don't want any comments in the compiled CSS](http://sass-lang.com/documentation/file.SASS_REFERENCE.html#comments).

scss/_normalize.scss

 /*! normalize.css v4.0.0 | MIT License | github.com/necolas/normalize.css */
 
-/**
- * 1. Change the default font family in all browsers (opinionated).
- * 2. Prevent adjustments of font size after orientation changes in IE and iOS.
- */
+//
+// 1. Change the default font family in all browsers (opinionated).
+// 2. Prevent adjustments of font size after orientation changes in IE and iOS.
+//
 
 html {
-  font-family: sans-serif; /* 1 */
-  -ms-text-size-adjust: 100%; /* 2 */
-  -webkit-text-size-adjust: 100%; /* 2 */
+  font-family: sans-serif; // 1
+  -ms-text-size-adjust: 100%; // 2
+  -webkit-text-size-adjust: 100%; // 2
 }
 
-/**
- * Remove the margin in all browsers (opinionated).
- */
+//
+// Remove the margin in all browsers (opinionated).
+//
 
 body {
   margin: 0;
 }
 
-/* HTML5 display definitions
-   ========================================================================== */
+// HTML5 display definitions
+// ==========================================================================
 
-/**
- * Add the correct display in IE 9-.
- * 1. Add the correct display in Edge, IE, and Firefox.
- * 2. Add the correct display in IE.
- */
+//
+// Add the correct display in IE 9-.
+// 1. Add the correct display in Edge, IE, and Firefox.
+// 2. Add the correct display in IE.
+//
 
 article,
 aside,
-details, /* 1 */
+details, // 1
 figcaption,
 figure,
 footer,
 header,
-main, /* 2 */
+main, // 2
 menu,
 nav,
 section,
-summary { /* 1 */
+summary { // 1
   display: block;
 }
 
-/**
- * Add the correct display in IE 9-.
- */
+//
+// Add the correct display in IE 9-.
+//
 
 audio,
 canvas,
@@ -54,125 +54,125 @@ video {
   display: inline-block;
 }
 
-/**
- * Add the correct display in iOS 4-7.
- */
+//
+// Add the correct display in iOS 4-7.
+//
 
 audio:not([controls]) {
   display: none;
   height: 0;
 }
 
-/**
- * Add the correct vertical alignment in Chrome, Firefox, and Opera.
- */
+//
+// Add the correct vertical alignment in Chrome, Firefox, and Opera.
+//
 
 progress {
   vertical-align: baseline;
 }
 
-/**
- * Add the correct display in IE 10-.
- * 1. Add the correct display in IE.
- */
+//
+// Add the correct display in IE 10-.
+// 1. Add the correct display in IE.
+//
 
-template, /* 1 */
+template, // 2
 [hidden] {
   display: none;
 }
 
-/* Links
-   ========================================================================== */
+// Links
+// ==========================================================================
 
-/**
- * Remove the gray background on active links in IE 10.
- */
+//
+// Remove the gray background on active links in IE 10.
+//
 
 a {
   background-color: transparent;
 }
 
-/**
- * Remove the outline on focused links when they are also active or hovered
- * in all browsers (opinionated).
- */
+//
+// Remove the outline on focused links when they are also active or hovered
+// in all browsers (opinionated).
+//
 
 a:active,
 a:hover {
   outline-width: 0;
 }
 
-/* Text-level semantics
-   ========================================================================== */
+// Text-level semantics
+// ==========================================================================
 
-/**
- * 1. Remove the bottom border in Firefox 39-.
- * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
- */
+//
+// 1. Remove the bottom border in Firefox 39-.
+// 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+//
 
 abbr[title] {
-  border-bottom: none; /* 1 */
-  text-decoration: underline; /* 2 */
-  text-decoration: underline dotted; /* 2 */
+  border-bottom: none; // 1
+  text-decoration: underline; // 2
+  text-decoration: underline dotted; // 2
 }
 
-/**
- * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
- */
+//
+// Prevent the duplicate application of `bolder` by the next rule in Safari 6.
+//
 
 b,
 strong {
   font-weight: inherit;
 }
 
-/**
- * Add the correct font weight in Chrome, Edge, and Safari.
- */
+//
+// Add the correct font weight in Chrome, Edge, and Safari.
+//
 
 b,
 strong {
   font-weight: bolder;
 }
 
-/**
- * Add the correct font style in Android 4.3-.
- */
+//
+// Add the correct font style in Android 4.3-.
+//
 
 dfn {
   font-style: italic;
 }
 
-/**
- * Correct the font size and margin on `h1` elements within `section` and
- * `article` contexts in Chrome, Firefox, and Safari.
- */
+//
+// Correct the font size and margin on `h1` elements within `section` and
+// `article` contexts in Chrome, Firefox, and Safari.
+//
 
 h1 {
   font-size: 2em;
   margin: 0.67em 0;
 }
 
-/**
- * Add the correct background and color in IE 9-.
- */
+//
+// Add the correct background and color in IE 9-.
+//
 
 mark {
   background-color: #ff0;
   color: #000;
 }
 
-/**
- * Add the correct font size in all browsers.
- */
+//
+// Add the correct font size in all browsers.
+//
 
 small {
   font-size: 80%;
 }
 
-/**
- * Prevent `sub` and `sup` elements from affecting the line height in
- * all browsers.
- */
+//
+// Prevent `sub` and `sup` elements from affecting the line height in
+// all browsers.
+//
 
 sub,
 sup {
@@ -190,66 +190,66 @@ sup {
   top: -0.5em;
 }
 
-/* Embedded content
-   ========================================================================== */
+// Embedded content
+// ==========================================================================
 
-/**
- * Remove the border on images inside links in IE 10-.
- */
+//
+// Remove the border on images inside links in IE 10-.
+//
 
 img {
   border-style: none;
 }
 
-/**
- * Hide the overflow in IE.
- */
+//
+// Hide the overflow in IE.
+//
 
 svg:not(:root) {
   overflow: hidden;
 }
 
-/* Grouping content
-   ========================================================================== */
+// Grouping content
+// ==========================================================================
 
-/**
- * 1. Correct the inheritance and scaling of font size in all browsers.
- * 2. Correct the odd `em` font sizing in all browsers.
- */
+//
+// 1. Correct the inheritance and scaling of font size in all browsers.
+// 2. Correct the odd `em` font sizing in all browsers.
+//
 
 code,
 kbd,
 pre,
 samp {
-  font-family: monospace, monospace; /* 1 */
-  font-size: 1em; /* 2 */
+  font-family: monospace, monospace; // 1
+  font-size: 1em; // 2
 }
 
-/**
- * Add the correct margin in IE 8.
- */
+//
+// Add the correct margin in IE 8.
+//
 
 figure {
   margin: 1em 40px;
 }
 
-/**
- * 1. Add the correct box sizing in Firefox.
- * 2. Show the overflow in Edge and IE.
- */
+//
+// 1. Add the correct box sizing in Firefox.
+// 2. Show the overflow in Edge and IE.
+//
 
 hr {
-  box-sizing: content-box; /* 1 */
-  height: 0; /* 1 */
-  overflow: visible; /* 2 */
+  box-sizing: content-box; // 1
+  height: 0; // 1
+  overflow: visible; // 2
 }
 
-/* Forms
-   ========================================================================== */
+// Forms
+// ==========================================================================
 
-/**
- * Change font properties to `inherit` in all browsers (opinionated).
- */
+//
+// Change font properties to `inherit` in all browsers (opinionated).
+//
 
 button,
 input,
@@ -258,51 +258,51 @@ textarea {
   font: inherit;
 }
 
-/**
- * Restore the font weight unset by the previous rule.
- */
+//
+// Restore the font weight unset by the previous rule.
+//
 
 optgroup {
   font-weight: bold;
 }
 
-/**
- * Show the overflow in IE.
- * 1. Show the overflow in Edge.
- * 2. Show the overflow in Edge, Firefox, and IE.
- */
+//
+// Show the overflow in IE.
+// 1. Show the overflow in Edge.
+// 2. Show the overflow in Edge, Firefox, and IE.
+//
 
 button,
-input, /* 1 */
-select { /* 2 */
+input, // 1
+select { // 2
   overflow: visible;
 }
 
-/**
- * Remove the margin in Safari.
- * 1. Remove the margin in Firefox and Safari.
- */
+//
+// Remove the margin in Safari.
+// 1. Remove the margin in Firefox and Safari.
+//
 
 button,
 input,
 select,
-textarea { /* 1 */
+textarea { // 1
   margin: 0;
 }
 
-/**
- * Remove the inheritence of text transform in Edge, Firefox, and IE.
- * 1. Remove the inheritence of text transform in Firefox.
- */
+//
+// Remove the inheritence of text transform in Edge, Firefox, and IE.
+// 1. Remove the inheritence of text transform in Firefox.
+//
 
 button,
-select { /* 1 */
+select { // 1
   text-transform: none;
 }
 
-/**
- * Change the cursor in all browsers (opinionated).
- */
+//
+// Change the cursor in all browsers (opinionated).
+//
 
 button,
 [type="button"],
@@ -311,30 +311,30 @@ button,
   cursor: pointer;
 }
 
-/**
- * Restore the default cursor to disabled elements unset by the previous rule.
- */
+//
+// Restore the default cursor to disabled elements unset by the previous rule.
+//
 
 [disabled] {
   cursor: default;
 }
 
-/**
- * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
- *    controls in Android 4.
- * 2. Correct the inability to style clickable types in iOS.
- */
+//
+// 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
+//    controls in Android 4.
+// 2. Correct the inability to style clickable types in iOS.
+//
 
 button,
-html [type="button"], /* 1 */
+html [type="button"], // 1
 [type="reset"],
 [type="submit"] {
-  -webkit-appearance: button; /* 2 */
+  -webkit-appearance: button; // 2
 }
 
-/**
- * Remove the inner border and padding in Firefox.
- */
+//
+// Remove the inner border and padding in Firefox.
+//
 
 button::-moz-focus-inner,
 input::-moz-focus-inner {
@@ -342,18 +342,18 @@ input::-moz-focus-inner {
   padding: 0;
 }
 
-/**
- * Restore the focus styles unset by the previous rule.
- */
+//
+// Restore the focus styles unset by the previous rule.
+//
 
 button:-moz-focusring,
 input:-moz-focusring {
   outline: 1px dotted ButtonText;
 }
 
-/**
- * Change the border, margin, and padding in all browsers (opinionated).
- */
+//
+// Change the border, margin, and padding in all browsers (opinionated).
+//
 
 fieldset {
   border: 1px solid #c0c0c0;
@@ -361,62 +361,62 @@ fieldset {
   padding: 0.35em 0.625em 0.75em;
 }
 
-/**
- * 1. Correct the text wrapping in Edge and IE.
- * 2. Correct the color inheritance from `fieldset` elements in IE.
- * 3. Remove the padding so developers are not caught out when they zero out
- *    `fieldset` elements in all browsers.
- */
+//
+// 1. Correct the text wrapping in Edge and IE.
+// 2. Correct the color inheritance from `fieldset` elements in IE.
+// 3. Remove the padding so developers are not caught out when they zero out
+//    `fieldset` elements in all browsers.
+//
 
 legend {
-  box-sizing: border-box; /* 1 */
-  color: inherit; /* 2 */
-  display: table; /* 1 */
-  max-width: 100%; /* 1 */
-  padding: 0; /* 3 */
-  white-space: normal; /* 1 */
+  box-sizing: border-box; // 1
+  color: inherit; // 2
+  display: table; // 1
+  max-width: 100%; // 1
+  padding: 0; // 3
+  white-space: normal; // 1
 }
 
-/**
- * Remove the default vertical scrollbar in IE.
- */
+//
+// Remove the default vertical scrollbar in IE.
+//
 
 textarea {
   overflow: auto;
 }
 
-/**
- * 1. Add the correct box sizing in IE 10-.
- * 2. Remove the padding in IE 10-.
- */
+//
+// 1. Add the correct box sizing in IE 10-.
+// 2. Remove the padding in IE 10-.
+//
 
 [type="checkbox"],
 [type="radio"] {
-  box-sizing: border-box; /* 1 */
-  padding: 0; /* 2 */
+  box-sizing: border-box; // 1
+  padding: 0; // 2
 }
 
-/**
- * Correct the cursor style of increment and decrement buttons in Chrome.
- */
+//
+// Correct the cursor style of increment and decrement buttons in Chrome.
+//
 
 [type="number"]::-webkit-inner-spin-button,
 [type="number"]::-webkit-outer-spin-button {
   height: auto;
 }
 
-/**
- * Correct the odd appearance of search inputs in Chrome and Safari.
- */
+//
+// Correct the odd appearance of search inputs in Chrome and Safari.
+//
 
 [type="search"] {
   -webkit-appearance: textfield;
 }
 
-/**
- * Remove the inner padding and cancel buttons in Chrome on OS X and
- * Safari on OS X.
- */
+//
+// Remove the inner padding and cancel buttons in Chrome on OS X and
+// Safari on OS X.
+//
 
 [type="search"]::-webkit-search-cancel-button,
 [type="search"]::-webkit-search-decoration {