Xbee Test updated with new outputs
Set Xbee Channel into program mode. Tried to make the Send and Recieve dest address working. I was unable to get it to work.

I also setup XBEE_1 #defines
Set up Dest and Source addresses
Merge branch 'master' into xbee
XBee Test now compiling, renamed messages.
xbee Test and Xbee heart beat now working.
Added Mavlink message Start_rescue
Merge branch 'master' into xbee
Merge pull request #22 from BananaSlug/xbee

Xbee