Cleaned up UI and GPS is almost done

I cleaned up the main activity page by getting rid of the spinner and the extra button. I left the search station option since right now we only have 15 stations predefined in the list. This can be removed if you guys want but IMO it should stay there since our current functionality is limited.

UseGPS will display a listview of the closest cities and call the GraphActivity when something is clicked. There is currently an issue with the listview (constantly refreshes) because the function will continuously update the gps coordinates, I do not know how to fix this.