update to angular-bootstrap 0.12.0 + fix breaking changes

details on breaking changes:
https://github.com/angular-ui/bootstrap/blob/eec68d81f4f72363d37493c495b
892347bdb9e1b/CHANGELOG.md

Conflicts:
	bower.json
Merge pull request #269 from jeromegv/upstream

fix getToggleElement on dropdown by updating to angular-bootstrap 0.12.0 #250