clean up imports: alphabetize, remove spaces, remove use of *, remove unused imports
Code Cleanup.
-  Removed unused ScannerService.

- Refactored the use of generic intent messaging to specific message
  actions, namespaced to their sending class.

- Cleanup naming conventions for Intent arguments. Added consistency to
using string constants for Intent arguments, rather than mixing strings
and string constants in the same block of code.

- Renamed messages to be clearer about their actions, based on what I
  can see the code is doing, specifically MainActivity ACTION_UNPAUSE_SCANNING
Service/client split, the service folder will become the lib that goes in fennec
Added comment to TurnOffReceiver regarding how to test it
Merge pull request #5 from garvankeeley/cleanup4

 Code Cleanup, and client/service split