Added URL field to Locations and Organizers models.
Use factories start
Use factories in User model spec
Use factories for event spec

Also refactored event spec to use expect syntax
Use factories for organizer model spec
Use factories for location model spec
Use factories for tag model spec
Use factories for event integration spec
Use factories for locations integration spec
Use factories for organizer integration spec
Merge pull request #23 from carolinagc/TestRefactoringWithFactories

Using factories
Added URL validation to Locations and Organizers models.
Fixed whitespace
Merge branch 'master' of github.com:carolinagc/webcalendar
Add method shown_events to differenciate when to show public and private events
Add request test for user registration and user sign in, add tests in events with sign in
Modify test to check that if signed_in private events can be seen
Modify when user signed in should see all events
Add string translation to de-yml NOT translated
Modify events test to check when public/private events are shown