Add OPCODES #48

Add speaker OPCODE and change data.
Cleaning up code and add comments to code.
Documentation #48

Add documentation and change baud to 9600
Documentation and new functions #48 #53

Add documentation.
Create function to change baudrate on BT module and reset arduino.
Documentation #48

Documentation and removed some bugs
Finished work on the bluetooth service. The service now creates a connection and runs in the background until the whole application is killed. Also did a lot of cleaning in the Devices class. #55
Work on bluetooth service

 - make service stop when the application is killed
 - some testing in MainActivity
Work on progress bar when connecting to device. Still bugs on connection.
deleted a line
merged master into bluetooth branch
Added test-dialog, partially fixed switching between BT device connections
added a fixme comment
Merge branch 'master' into iss48
Merge branch 'bluetooth' into iss48
Merge branch 'bluetooth' into iss48
Merge with master and bluetooth branch. Fix merging conflicts