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.
Add `try` and `catch` to keywords
Merge pull request #11878 from ZDroid/patch-1

Add `try` and `catch` to keywords
Fixes #10370: Improved and deprecated dropdown menu alignment options

* Removes an old pair of selectors that didn’t properly target the
right-aligned navbar alignment of dropdown menus.
* Deprecates the `.pull-right` alignment in favor of a more specific
and unique class name.
* Adds `.dropdown-menu-right` as the new alignment class. This is then
mixin-ed into the `.navbar-right.navbar-nav` dropdown menus for
auto-alignment.
* To override that auto-alignment, use `.dropdown-menu-left` as needed.
Merge branch 'master' of github.com:twbs/bootstrap
Fixes #10505: Document more of LESS vars and mixins
Merge branch 'master' into pr/10951

Conflicts:
	dist/css/bootstrap.min.css
	less/modals.less
mention lack of support for split button dropdowns in vertical button groups
Fixes #10921: Add support for input groups within button toolbars

* Floats any `.input-group` within a toolbar
* Simplifies the CSS to remove sibling selectors and instead use a
negative amrgin on the parent with only `margin-left`

See it in action: http://jsbin.com/aGEcUqAT/1/.
Merge pull request #11286 from BBosman/well-border

Add well-border variable
Merge branch 'master' into pr/11107

Conflicts:
	docs-assets/js/raw-files.js