add responsive CSS to hyperlinked images when thumbnail caption markup is used

When thumbnail caption markup is used in combination with a hyperlinked image, the image is not responsive. (non-hyperlinked images are fine, like the example in the docs) Adding a selector to apply responsiveness to hyperlinked images when thumbnail captions are used.
Adding contextual styles to list-items
Active state overrides contextual list-item styles
Fix glyphicon class name wrapping in IE
Update navbar.less

fix for issue #11243
add support for button dropdowns in justified button groups
Fixes #10716: Update what's included docs to add info on both download options
grunt
Shorten sticky footer examples footer content to prevent wrapping
Fixes #11623: Reset position to static for grid columns within tables to unfuck borders in IE9/10 and Firefox
Remove browser default top margin from dl elements
Fixes #11658: Increase min-height of .radio and .checkbox for horizontal forms to ensure alignment of content below
grunt
Merge branch 'master' into pr/11536

Conflicts:
	dist/css/bootstrap.min.css
Add docs example to go with #11536
Use mixin instead of whole code
Fixes #10941: Fix Glyphicons path for those importing bootstrap.less from another directory
Merge pull request #11662 from ZDroid/deprecation-fix

Use mixin instead of whole code
fixes #11508: mention in docs that inline forms only work at 768px and up
Merge branch 'master' of github.com:twbs/bootstrap