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
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
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).
#11464 - Fix JS noConflict mode - Refactor all plugins to use an internal reference to the jQuery plugin, because in noConflict mode you can never expect to be defined on the jQuery object
fires closed.bs.alert *after* DOM detach()

fires closed.bs.alert *after* element is removed from DOM.
Previously it fired while the element was still attached.
Fixed navbar radius of example at docs
fixes https://github.com/twbs/bootstrap/issues/13367

Second color stop value should be percentage instead of decimal value.
Update type.less

For better readability on mobile devices
Remove sr-only from components/dropdowns example

Assuming sr-only is used in the actual live code so that the menu can be
shown open already ... but having sr-only in the highlighted example
code itself is confusing/misleading.

Also, change the text for the button from "Dropdown" to "Dropdown
trigger" for clarity (and it then matches
http://getbootstrap.com/javascript/#dropdowns)
Update alert.js

Added call to remove() after event fires to clean up data as per discussion at #12379
Merge pull request #13437 from saas786/master

fixes #13367
Merge pull request #11966 from colllin/noconflict

Fix #11464 - JS noConflict() mode not working in 3.0.x
Merge pull request #13449 from sejr/master

Increase .lead font-weight for better readability on mobile
grunt dist
Merge pull request #13328 from thebigredgeek/master

Added bower reference to main less file
explain
grunt dist