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Consolidate redundant heading style declaration

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Adds linting error for undefined variables

Reorder HTML attributes in Navs documentation

Attribute order now adheres to the Code Guide
(http://codeguide.co/#html-attribute-order).

See http://trac.webkit.org/changeset/191954
Refs #15968

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Give better description of IE9 transparent click bug & workaround

Simplify .img-retina mixin and add explanatory comments

Move .bg-* utility classes into separate file

linking to the color scheme directly

Refs #17913
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Add MS Edge to Autoprefixer config

Because of a color scheme has a color and background color.

Add http://wkbug.com/150715 to Wall of Browser Bugs

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Trivially simplify IE10 Mobile viewport bug workaround

Update to Jekyll v3.0.0.

See the IE9 note in https://developer.mozilla.org/en-US/docs/Web/CSS/%3Ahover#Browser_compatibility
The prereqs to trigger the bug are still present in v4.
/fyi @mdo

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Per http://caniuse.com/#feat=documenthead , document.head is supported in IE Mobile 10+,
so slightly simplify the JS accordingly.

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Remove http://wkbug.com/149935 from Wall of Browser Bugs

It's been fixed in WebKit Nightly!
See https://trac.webkit.org/changeset/191623 and http://wkbug.com/149366
Refs #17438, #14237

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Adding autocomplete attribute in docs input search

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