Telemetry: Create interface for telemetry slave tasks and start implementing Logging as one
Android Logging: Port the code from the previous logger activity to the telemetry task
Android Logging: Install the new logging object to the TelemetryTask

However, currently there is no way to start and stop logging.  It is
always logging when connected to a UAV.
Fix: Rename the various tasks
AndroidGCS: Make the TabletInformation task use teh ITelemTask interface
AndroidGCS: Add interface to get the Logger task from the telemetry service
AndroidGCS Logger: Update the UI to show the stats from the logging service
AndroidGCS logger: List the log files in the display screen
AndroidGCS Logger: Create email with log file when it is selected
AndroidGCS: Change message for logging send file
TabletInformation: Force this to use the GPS position

Previously it got the best provider which would sometimes be
the network.  This is unacceptable for what we will use it for.
Temporary patch - add a specific git ID and force the mode to use camera poi
for tablet information
Android Telemetry: Make sure when using UAVTalk relay that we still connect

Previously android required successfully setting the handshakereq value on
GCS Telemetry to connect.  However, when using UAVTalk relay that is all
handled on the main GCS side.  This detects when that appears to be the
case and receives all the object updates anyway.
Android Logging: Move file location to TauLabs
Android Logging: Add the git hash and uavo hash in the header

This was a bit awkward as logging starts as soon as a connection is made.  This
delays writing any logging until FirmwareIAP is updated so the header can be at
the beginning of the file.
Android Logging: Fix crash when no log entries

The file list was returning a null array instead of an empty
array so we need to handle that condition.
Logging: Fix crash on disconnect

When a proper connection wasn't established but the logging object was
created it can attempt to close the fileStream (that doesn't exist) on
disconnect resulting in a null pointer exception.  This checks the
pointer first and clears it.

Fixes #242