Update devDependencies and gems.

Downgrade bundlesize until they make brotli optional since it doesn't work with node.js 10.x yet.

So, babel, qunit/karma-qunit and bundle-size aren't the latest versions.

Gemfile

 source 'https://rubygems.org'
 
 group :development, :test do
-  gem 'jekyll', '~> 3.8.0'
+  gem 'jekyll', '~> 3.8.1'
   gem 'jekyll-redirect-from', '~> 0.13.0'
   gem 'jekyll-sitemap', '~> 1.2.0'
-  gem 'jekyll-toc', '~> 0.5.1'
+  gem 'jekyll-toc', '~> 0.6.0'
 end

Gemfile.lock

@@ -8,15 +8,15 @@ GEM
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
-    eventmachine (1.2.5)
-    eventmachine (1.2.5-x64-mingw32)
+    eventmachine (1.2.6)
+    eventmachine (1.2.6-x64-mingw32)
     ffi (1.9.23)
     ffi (1.9.23-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.0)
+    jekyll (3.8.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -35,8 +35,8 @@ GEM
       sass (~> 3.4)
     jekyll-sitemap (1.2.0)
       jekyll (~> 3.3)
-    jekyll-toc (0.5.2)
-      nokogiri (~> 1.6)
+    jekyll-toc (0.6.0)
+      nokogiri (~> 1.7)
     jekyll-watch (2.0.0)
       listen (~> 3.0)
     kramdown (1.16.2)
@@ -71,10 +71,10 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
-  jekyll (~> 3.8.0)
+  jekyll (~> 3.8.1)
   jekyll-redirect-from (~> 0.13.0)
   jekyll-sitemap (~> 1.2.0)
-  jekyll-toc (~> 0.5.1)
+  jekyll-toc (~> 0.6.0)
 
 BUNDLED WITH
    1.16.1

build/.htmllintrc

@@ -5,9 +5,9 @@
   "attr-no-unsafe-char": true,
   "attr-quote-style": "double",
   "attr-req-value": true,
-  "attr-validate": true,
+  "attr-validate": false,
   "class-no-dup": true,
-  "class-style": "dash",
+  "class-style": "none",
   "doctype-first": true,
   "doctype-html5": true,
   "fig-req-figcaption": false,
@@ -19,7 +19,7 @@
   "html-valid-content-model": false,
   "id-class-ignore-regex": "(onclick|content|[a-z]+([A-Z][a-z])+)",
   "id-class-no-ad": true,
-  "id-class-style": "dash",
+  "id-class-style": false,
   "id-no-dup": true,
   "img-req-alt": "allownull",
   "img-req-src": false,
@@ -29,12 +29,13 @@
   "input-req-label": false,
   "label-req-for": true,
   "lang-style": "case",
+  "line-no-trailing-whitespace": false,
   "line-end-style": "lf",
   "spec-char-escape": false,
   "table-req-header": false,
   "tag-bans": ["b", "i"],
   "tag-close": true,
-  "tagname-lowercase": true,
+  "tag-name-lowercase": true,
   "tag-name-match": true,
   "tag-self-close": false,
   "text-ignore-regex": false,

package.json

@@ -91,46 +91,46 @@
     "@babel/cli": "7.0.0-beta.44",
     "@babel/core": "7.0.0-beta.44",
     "@babel/preset-env": "7.0.0-beta.44",
-    "autoprefixer": "^8.3.0",
+    "autoprefixer": "^8.4.1",
     "babel-eslint": "^8.2.3",
     "babel-plugin-istanbul": "^4.1.6",
     "babel-plugin-transform-es2015-modules-strip": "^0.1.1",
-    "bundlesize": "^0.17.0",
+    "bundlesize": "^0.15.3",
     "clean-css-cli": "^4.1.11",
     "cross-env": "^5.1.4",
     "eslint": "^4.19.1",
     "eslint-plugin-compat": "^2.2.0",
     "glob": "^7.1.2",
-    "htmllint-cli": "^0.0.6",
-    "jsunitsaucelabs": "^1.3.0",
-    "karma": "^2.0.0",
+    "htmllint-cli": "^0.0.7",
+    "jsunitsaucelabs": "^1.3.2",
+    "karma": "^2.0.2",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage-istanbul-reporter": "^1.4.2",
     "karma-detect-browsers": "^2.3.2",
     "karma-firefox-launcher": "^1.1.0",
     "karma-qunit": "^1.2.1",
     "karma-sinon": "^1.0.5",
-    "node-sass": "^4.8.3",
-    "nodemon": "^1.17.3",
+    "node-sass": "^4.9.0",
+    "nodemon": "^1.17.4",
     "npm-run-all": "^4.1.2",
     "popper.js": "^1.14.3",
     "postcss-cli": "^5.0.0",
     "qunitjs": "^2.4.1",
-    "rollup": "^0.58.0",
+    "rollup": "^0.58.2",
     "rollup-plugin-babel": "4.0.0-beta.4",
     "rollup-plugin-node-resolve": "^3.3.0",
     "shelljs": "^0.8.1",
     "shx": "^0.2.2",
-    "sinon": "^4.5.0",
+    "sinon": "^5.0.4",
     "sri-toolbox": "^0.2.0",
     "stylelint": "^9.2.0",
     "stylelint-config-recommended-scss": "^3.2.0",
     "stylelint-config-standard": "^18.2.0",
     "stylelint-order": "^0.8.1",
-    "stylelint-scss": "^3.0.0",
-    "uglify-js": "^3.3.21",
+    "stylelint-scss": "^3.1.0",
+    "uglify-js": "^3.3.23",
     "vnu-jar": "^18.3.0",
-    "workbox-build": "^3.1.0"
+    "workbox-build": "^3.2.0"
   },
   "engines": {
     "node": ">=6"