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
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
fixed two typos in carousel.less

carousel.less has two typos in glyphicon classnames. fixed them.
Sticky footers without any wrappers
Added border radiuses to table when in a panel. Fixes #12461
Fixes #12447: Properly reset borders on table cells in panels
Drop -o-user-select
Omit semicolons consistently in docs
Replace wildcard with file name
Merge pull request #12648 from ZDroid/index.html-only

Replace wildcard with file name
Fix wrong id
Nuke shit I added in 4d7b2ddba92e47f923d22d9d7b23cb7b0a3e0bc2 that shouldn't come until v4
Merge branch 'master' into panels_and_tables

Conflicts:
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
	docs/dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.min.css
Merge pull request #12633 from twbs/panels_and_tables

Properly reset borders on table cells in panels
disable BrowserStack tests due to flakiness

Running "browserstack_runner" task
Using config: /home/travis/build/twbs/bootstrap/browserstack.json
Launching server on port: 8888
Downloading tunnel jar to `/home/travis/build/twbs/bootstrap/node_modules/browserstack-runner/lib/BrowserStackTunnel.jar`
Launching tunnel
Error: Invalid or corrupt jarfile /home/travis/build/twbs/bootstrap/node_modules/browserstack-runner/lib/BrowserStackTunnel.jar
[Runner alert] Tunnel launch timeout
Exiting
Non existent tunnel