Added new model - Activation
Added query functions to activation
Made it possible to schedule an activation
Limited the minute chooser.
Improved Activation model
Added execution of scheduled activations
Changes GetForPresentation to take Key instead of a whole presentation
Implemented future activations list on presentation's page
Implemented deletion of activations
Added schedule to the upload page
UI and UX changes
Merge branch 'scheduledActivation'

Conflicts:
	app.yaml