#9 Check if GPS Enabled & Enable if not

Checking if it's enabled is easy enough, but we can no longer enable it programmatically. 
This has to be done manually now (as of about API level 10/11, thanks Android guys!)

If it's disabled, we alert the user and give them the option to turn it on. If they elect to do so, we just take them to the location settings screen so they can enable manually.