Update scrollspy.js

Scrollspy target in tab content does not work properly. Calling .parents('.active') will return all parents with an active class (including the tab pane). Changing this line to .parentsUntil(this.options.target, '.active') should resolve the issue. This will scope the query to only search for active elements inside the scrollspy target.
Added unit test for removing only active class from within the scroll spy key.
Fix: IE10 or lower incorrectly determines the scrollheight of the body. Use document.documentElement for IE. To make this browser agnostic, the maximum scrollheight of both body and documentElement is used.
Fix: IE10 or lower incorrectly determines the scrollheight of the body. Use document.documentElement for IE. To make this browser agnostic, the maximum scrollheight of both body and documentElement is used.
Add Embed responsive utility
fix #12154
Merge branch 'responsive-embed' of https://github.com/boulox/bootstrap into boulox-responsive-embed

Conflicts:
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
Fix #12025 and minify styles
fix #12007 by clarifying target of dropdown events
refactored and renamed grid mixins
fixed first element padding of list-inline
Added .list-group-item.disabled

Added support for disabled List group item.
Update variables.less
rm callout about creating .container-fluid-alikes now that .container-fluid has been added
mv .img-responsive docs from Overview to Images section
Remove redundant :-moz-placeholder styles

No need for old Firefox versions support.
Don't re-set indent style for [*.py]

Just inherit it from [*].
Merge pull request #12503 from ZDroid/ed

Don't re-set indent style for [*.py]
Improve alignment of the dashboard placeholder images
Fixes #12435
add Bower badge to README