Implemented Settings and List Items in Stalls

- Added Listing of items in stalls activity
- Added Settings activity
- Added checking if app is running on SDK (App doesn't work on a SDK due
to sdcard, might fix in future)
- Added new database method to get the specific food stall
- Implemented new Adapter for the listView in listing for food items
- Changed all activities to call for application context to reduce
crashes
- Removed some unimplemented messages as the activities and actions are
implemented
- Added check if database is up to date, and not update if its the case
to reduce start-up time
- Added pausing and resuming support for Android SDK 21 (5.0 :lollipop:
)
- Bug Fixes