Alex branch

Updates:
1) Disallowed users to proceed if no material is selected.
2) Disallowed users to proceed if no location is entered.
3) Able to get latitude and longitude based on the address. Sorting is now based on dynamic location.
4) When click "Get direction", will ask whether to use Browser or Google Maps to open. Then will go to navigation page.
5) Added progress dialog when searching for locations.