Better Pickers and Parse Push Implementations

Functional changes:

1) Login cartoon shows at startup
2) Better Picker - Date and Time setup
3) Push notifications are sent to all group members when Done is pressed

Code changes:

A) Manifest contains changes to enable ParsePush notifications, and
custom reciever for VotingActivity

B) joda-time library added for Better Picker

C) activity_voting layout modified to add pickers (Sorry for the current
bad UI state)

D) VotingActivity merged with Raji's latest changes, and include Better
Picker and ParsePush implementations - both are thoroughly commented and
support (3) above.

E) VotingActivityReceiver is a custom broadcast reciever for our app.
Not fully developed, but supports functionality (3) above.