[WIP] - Create table relation between course and subject.
[WIP] Add course_id field to teams table to add relationship [team]>-[course]
[WIP] - Add relationships
[FIX] Change position annotate
[WIP] Test new travis configuration
[WIP] - Add relationships in classes. **Branch unstable**
[WIP] - Configure new relations
:bomb: Upgrade Rails to edge version (3.2.12). This version contains one securyt fix and recommended update immediately. See [Ruby on Rails official weblog :link:](http://weblog.rubyonrails.org/2013/2/11/SEC-ANN-Rails-3-2-12-3-1-11-and-2-3-17-have-been-released/).