Refactored ribbon.
Explorer ribbon setup.
Added Bootstrap module to backend site.
Added UI component Alert.
Add Alert component to backend.
Added vmodule Bootstrap.
This module should be moved to own repository in the future.
Merge pull request #153 from kormik/feature/bootsrap-module

Added vmodule Bootstrap.
Merge branch 'develop' into feature/backend
Merge branch 'feature/backend-bootstrap' into feature/backend
Merge branch 'feature/alert' into feature/backend
Replaced tables in layout by Bootsrap classes.
Merge branch 'feature/backend-ribbon' into feature/backend
Changed TabContainer and Finder templates according to Bootstrap.
Merge remote-tracking branch 'v2/develop' into hotfix/repository-cms-indexer
Merge remote-tracking branch 'v2/feature/backend' into hotfix/repository-cms-indexer
Backend refactored to API changes