Remove -webkit-backface-visibility on skew mixin

Ref #5319 - This rule is causing pixelated edges on iOS. Removing
it makes everything smooth across all OS's, browsers, and devices.
fix pluralization since "a" is in front
Merge pull request #7287 from waynn/patch-1

fix pluralization since "a" is in front for issue #6342
Fix dropdown (and therefore typeahead) wrap

I have recently been experimenting with a lot of Typeahead controls, and I ran into a situation where my Typeahead was too wide for my screen, particularly on mobile devices, and it was not wrapping as I had expected it to do.

http://jsfiddle.net/Mtxkn/3/

Changing the CSS for `.dropdown-menu > li > a` to `white-space: normal` causes it to wrap in every scenario that I have seen, whereas leaving it as `nowrap` never does what I want when the text is too long for a given row.

It's possible that this has ramifications for other dropdown menus, but honestly I expect that even those would prefer to wrap than to extend the screen horizontally.  If that is not the case, then it would work to change the typeahead version of this only:

```css
.typeahead > li > a {
    white-space: normal;
}
```
Remove `text-rendering`
Give horizontal-three-colors a horizontal filter gradient

Previously the filter had GradientType=0, which would render a vertical
gradient rather than the horizontal one implied by name
docs fixes with new .bs-docs-container; fixing some lingering grid classes
Refactor .list-inline and .list-unstyled

* Instead of shared and separate CSS, isolate by class for easier mixin-ability
* .list-unstyled is now used as a mixin in .list-inline
clarify docs on unstyled lists
turn docs navbar into left navbar
new subnav on all pages
holy crap new docs layout separate from home, no more top navbar
none of that
rejigger some content and start exploring section headings
move nav into partial; rejigger content some more
Make sure form actions are properly aligned with form-horizontal
Merge pull request #7409 from andriijas/3.0.0-wip-formactions

Make sure form actions are properly aligned with form-horizontal
remove nonexistant example
correct page title and nuke liquid description
dat red