Only use Bugsense for the Wireless MIT AICompanion (and *not* for the
USB Debugger) and send exceptions from Kawa so we get exceptions on
the Main UI thread as well as background threads. Upgrade to Bugsense
3.1.

Move the Bugsense API Key to GitBuildId template. You provide it at
compile time on the "ant" build command line as "-Dbugsense.apikey=<key>"
If you do not provide it, Bugsense is diabled.

Change-Id: I127d3f84636687721bce1557139acb5a781e8f3c