7) Add navigation Drawer

[RaphaelTurtlePower]

See title.
What to add:

New Event
Settings
Notifications
Exit

[rongjiang]

Drawer added but there needs some work to pass the data properly to map fragment.

Working on it...

[rongjiang]

Completely re-structure the activity/fragment code to accommodate nav drawer. The Drawer is done.

What's pending: styling, shadow, icons.