Customizer: switch to UglifyJS2 (v2.4.13).

The uglify build is generated with `uglifyjs --self -o uglify.min.js`.
Add the jquery check in customizer's output.
Add the license header in the non minified build too.
Run `grunt`.
Fix form-control-feedback position when label has sr-only class
Fix indent
added bower reference to main less file
Add documentation for using optional icons with sr-only labels
fixes #11099 - $.collapse() overrides the original dimension of the coll...
fixes #13296 Dropdown disappears with right-click on Firefox
FIX: #13355. Added .navbar-nav to migration change list.
Merge pull request #13354 from twbs/fat-13296

fixes #13296 Dropdown disappears with right-click on Firefox
Merge pull request #13306 from twbs/fat-11099

fixes #11099 - $.collapse() overrides the original dimension of the coll...
Update composer.json

Update minor version of alias to proper.
Merge pull request #13385 from vnagara/patch-1

Update composer.json
move call for removeBackdrop() to backdrop()

Closes #11958 by rebasing & merging it
Merge pull request #13151 from twbs/customizer-uglifyjs2

Customizer: switch to UglifyJS2
add IE10 viewport bug workaround to examples

Closes #13379.
grunt dist
add missing operators to some JSCS rules that we already comply with