don't remove title attribute for tooltips
fixes #6445
Merge pull request #6481 from pseidemann/patch-1

don't remove title attribute for tooltips
dont remove title attribute part 2
unit tests
Merge pull request #6813 from Yohn/patch-12

don't remove title attribute for tooltips for 2.3-wip
Fixes #6823: add some docs notes about tooltips in input groups
if no callback, don't try to call callback ya goof
Merge branch '2.3.0-wip' of github.com:twitter/bootstrap into 2.3.0-wip

Conflicts:
	docs/assets/js/bootstrap.min.js
only fire hidden once backdrop has been removed
remove prevent default on focus
add 2.3 changelog section
Merge branch '2.3.0-wip' of github.com:twitter/bootstrap into 2.3.0-wip
Merge branch '2.3.0-wip'
Allow Boostrap typeahead updater function to return nothing and not wipe out the current value.

Conflicts:
	docs/assets/js/bootstrap.min.js
Add a container option to the typeahead - matches tooltip functionality.

Conflicts:
	docs/assets/js/bootstrap.min.js