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
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
account for #11050 in the docs