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
Add nested kbd element styles for actual keys or inputs
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).
add button to toggle the optional theme when viewing the docs; fixes #9764
regenerate minified docs JS & CSS
Fixes #13478, reverts #10941
cleanup
Temporarily revert README deletions from #13470,
pending the release of v3.2.0's updated hosted docs.

Fixes #13572.
fixes #12211: Scrollspy: Navs in different tabs can interfere with each othe
Merge pull request #13576 from twbs/fat-12211

fixes #12211: Scrollspy: Navs in different tabs can interfere with each ...
nuke rtl
Merge branch 'master' of github.com:twbs/bootstrap
grunt
nuke the rtl docs
nuke the rtl example
Merge branch 'master' into icon_paths

Conflicts:
	dist/css/bootstrap-rtl.css
	dist/css/bootstrap.css.map
	dist/js/bootstrap.min.js
	docs/dist/css/bootstrap.css.map
	docs/dist/js/bootstrap.min.js
remove the comment
Merge pull request #13369 from armikbd/bootstrap-itsme

Dropdown menu in justified button-group
grunt dist
Merge branch 'master' into icon_paths

Conflicts:
	dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.css.map