Add basic calendar to choose date.
Fix Month display.
Update some strings. Add buttons in calendar selection.
Add logic to pass selected dates back to event creation activity.
Add activity to select time.
Start adding logic to get EventDate model from selection.
Add EventDateCollection. Refactor event to use new collection.
Refactor JSON serialization.
Fix bug in EventDateCollection.
Update create event activity to handle multiple date choice.
Start adding activity to select contacts.
Add some logic to select users.
Fix bug in ContactList.