Added shows to screen. Method checking if can add a show to screen at daterange.
Whole backend for show creation.
Test fixes.
Test fixes
Test fixes
Merge remote-tracking branch 'origin/feature/adding_shows_backend' into feature/adding_shows_backend
Test fixes
Merge remote-tracking branch 'origin/master' into feature/adding_shows_backend

Conflicts:
	app/models/screen.rb
	spec/models/screen_spec.rb
Grrrr merge conflicts
Merge remote-tracking branch 'origin/master' into feature/adding_shows_backend

Conflicts:
	app/models/screen.rb
Merge pull request #2 from s1mplex/feature/adding_shows_backend

Feature/adding shows backend