removed outline from modal
Customizable backdrop opacity
Added opacity to customizer and rebuilt customizer
Options of sizes added in modal
Adjust in modal size rules
Add well-border variable

Add a variable to allow the well border color to be specified.

The reason I'd like to see this included is that my companies styleguide
requires an explicit border color on well-like constructs. This variable
allows me to easily override the default to use that color.
Fix #11400 and #11431
Reduce size of the visibility styles
Add `.animation-*()` mixins
Remove unused variables.
use @zindex-modal for .modal and @zindex-modal-background for .modal-backdrop.
removed z-index for .modal-dialog, it was not necessary because the parent element (.modal) already has a z-index.
add dist files.
';' isn't needed
Merge pull request #11874 from ZDroid/hotfix

';' isn't needed
use S3-based node_modules caching
time all the things
Merge pull request #11869 from twbs/cache-node_modules

use S3-based node_modules caching
Fixes #10495: Float Glyphicon and set margins in .navbar-brand to ensure there is no added height because wtf even is CSS
Merge branch 'master' into pr/11868

Conflicts:
	dist/css/bootstrap.min.css
Fixes #11867: Add `@panel-body-padding` variable