Fixed nested tab elements li activation

Added closest li instead of direct parent so that you can nest multiple elements within tabs, such as button groups
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
Wait for the expected target during a collapse

Actually wait for the collapsed item to complete. If complete is called
with other target, instead of simply returning and do nothing, wait again
until the proper target triggers the event (otherwise this leaves collapse
in a broken state).
rm not particularly useful @zindex var comments
fix #13340 by documenting @icon-font-path & @icon-font-name more
Merge pull request #13353 from twbs/fix-13340

Document @icon-font-path & @icon-font-name more
fixes #11099 - $.collapse() overrides the original dimension of the coll...
Merge pull request #13330 from Kronuz/patch-1

Wait for the expected target during a collapse
fixes #13296 Dropdown disappears with right-click on Firefox
Added specificity note to docs per issue #13332
Fixed typo and added leading space
Dropdown menu in justified button-group

It seems that dropdown-menu in justified button-group appears at the far
left of the group. Check the problem in [Bootstrap
site](http://getbootstrap.com/components/#btn-groups-justified).
grunt dist