Added custom class and layout for initializing spinner values
(NothingSelectedSpinnerAdapter.java).  Added spinner for users to select
names from the prepopulated list (once it is synced from the master DB).
Disabled Login button until a user has selected a name.  Added progress
notification icon to ensure user realizes data is being retrieved during
initial user name pull from the database (removed progress bar on load).
Currently username/password functionality is not complete.  Simply
select a name to click login.  User is properly set regardless of
password entry.