Document new modal sizes
Merge branch 'master' into pr/11302

Conflicts:
	dist/css/bootstrap.css
	dist/css/bootstrap.min.css
Merge branch 'master' into pr/11435

Conflicts:
	dist/css/bootstrap.css
	dist/css/bootstrap.min.css
Merge pull request #10704 from XhmikosR/various

rm unused vars
Merge pull request #11326 from ZDroid/animations

Add `.animation-*()` mixins
parallelize Travis using build matrix & test subsuites
document #11326
correct bookmark prefix
Merge pull request #11864 from twbs/parallelize-build

parallelize Travis using build matrix & test subsuites
Fixes #11561: Add float: left; to .form-control within input groups to prevent IE9 from screwing up placeholder text and select menu arrows
Merge branch 'master' of github.com:twbs/bootstrap
change class name
Fixes #11572: Add contextual background-color classes to match text classes; move both sets of classes to Helper Classes section of the CSS docs
Fixes #11555: Add `@tooltip-opacity` variable
Fixes #11588: Scope font-size to only p elements in a .jumbotron and remove the supersized line-height from the base class
Fix wrong variable name
Merge pull request #11879 from ZDroid/wrong-variable

Fix wrong variable name
Fixes #11801: use correct variables for grid containers
Merge branch 'master' of github.com:twbs/bootstrap
comments and spacing