Added preferences activity/fragment
  --settings added under actionbar (though not functional yet)

 Signal related output stuff moved to its own fragment and out of the main activity.

 Moved the filtering/formatting of the raw signal data out of SignalData.java to make things more module. New class for filtering the array is SignalArrayWrapper.java

 SignalData.java is now SignalMapWrapper.java as it wraps the formatted array in a map with the network info.