Merge pull request #690 from sergeyklay/feature-bootstrap-3

Updated PM feature
Update feature: Better naming convention for module paths and theme paths
Fixed issue: Fix datetime picker respect php strtotime conversion format
Update feature: Better comment form and admin comment form
Fixed issue: Comment list cleanup. Todo merge comment css in theme css
Fixed issue: Removed comment css and merged into theme.css
Updated cerber theme
Fixed issue: Removed unused comment.css