Get rid of Fabric by creating own scripts

Changed travis to call the tests directly
Merge pull request #1339 from ostcar/make1

Get rid of Fabric by creating own scripts.
Refactory of the participant app

* New user model (used Django's AbstractBaseUser)
* Renamed the app to users
* removed person api

See #861

Fixed #576 #478
Merge pull request #1343 from ostcar/user

New users app.
Updated Django to 1.7.x
Merge pull request #1353 from ostcar/django17

Updated Django version to 1.7.