If the popover's title contains no text, hide it via JS. Previously was
done via CSS's `:empty` property, but that doesn't work in IE8, so JS
it is.

/cc @fat becaue I probably did this wrong <3

Fixes broken layout for .input-group-addons within .input-large. Follows...

Add heading font family variable

rename '.navbar .nav' to '.navbar-nav'

* Remove plugin file and put JS inline
* Update grid layout to use tablet columns
* Switch from LESS to CSS for transition
* Pad footer sides for better mobile rendering
* Spacing cleanup

Merge branch 'offcanvas-example' of https://github.com/trumbitta/bootstrap into trumbitta-offcanvas-example

Add missing property to form-horizontal docs

docs/javascript.html: backticks -> <code>

3.0.0-wip - Fixed 'Running Doc. Locally" Link

* Updates `.table` to always enforce a solid white background
* Update button groups and dropdowns to always use black carets
* Add a 1px solid black border to labels (in the future we should add a
border to these perhaps for better printing)

Instead of clearing the entire `.dl-horizontal`, we've moved the
clearfix mixin to the `dd` level to solve two problems in one: empty
`dd`s mid-list, and empty `dd` as the last child.

Addresses a few old issues, including #2824, #3819, #3821, #4062,
#6707, and #7180.

Sorry that took so long :D.

Also add better comments

Turns out we were nixing the default browser spacing for bullets and
numbers, so this reverts that and instead just twerks the top/bottom
`margin`.

Fixes broken layout for .input-group-addons within .input-large. Follows 6ce154c7

redundant lines removed

components docs: backticks ==> <code>

upgrade holder to 2.0, update thumbnail examples in docs to fit inside containers

CSS docs page: backticks ==> <code>