removed outline from modal
Customizable backdrop opacity
Added opacity to customizer and rebuilt customizer
Adding contextual styles to list-items
Active state overrides contextual list-item styles
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
Fixed single btn in btn-group-veritcal not being rounded
Reduce size of the visibility styles
Update holder.js to v2.2.
Update jszip.js to the latest git.
Update filesaver.js to the latest git.
Added text-justify class to type.less
Get rid of empty line before the last closing bracket
Merge pull request #11690 from lipis/patch-2

Get rid of empty line before the last closing bracket
Gruntfile.js: Set line feed char to '\n' to get same result on all platforms.
add .gitattributes file to enforce Unix newlines within the repo
reference root issue in explanatory comment