Change background of current status in the scrum bar

See #29
Show/hide buttons according to user's role over a project

close #30
Change badges colors of the scrumbar

references #29
Move repositories in Repository directory
Change positioning of elements in the navbar

references #38
Merge branch 'user-authorization'
Merge branch 'scrumbar-bkg'
Fix html indent in navbar
Merge branch 'navbar'
Update dependencies
Fix login feature
The product owner can refuse or accept a user story
Refactor some stories
Block a story
Continue refactoring of stories
Fix Behat commands for travis-ci
Merge branch 'master' into us-comments
Move CommentRepository to the correct folder
Add behat feature for comment testing