Added Parse branch
added Parse objects and collections
can retrieve user's todos after login
fixed blank todos on enter bug
added strikethough for completed todos, will persist strikethrough on login
new users go straight to todo screen after sign up
added a logout button, undelegate events
added a username box
fixed bug where models save into previous users
cleaned up some code
1st push to loginFix branch
refactored code
merged with loginFix