added parent activity to MainActivity. Back buttuon in upper left corner is now working.
set screenorientation on welcome screen
fixed install button and redirect to device list.
Reset arduino from android #84
Fixed imaging throughout app. Correct image according to category
dunno
Closes #78

* Major bug fixes concerning the connection with bluetooth devices. Added 30 sec timeout on connection in both device list and add device screen. Not finished with adding with QR.
*#78. I think this is closed as I havent encountered this problem after the above was fixed.
Test application #85

A testapplication. Print temperature on LCD.
Further bugfixing

* Closes #78. I have never ecountered that the connected device is unselected in device list.
* Fixes concerning connection with QR-code. The device name and mac address is now stored properly and the connection works.
* The android device no longer need pairing with the arduino.
Merge branch 'bugfixing'
Merge remote-tracking branch 'origin/master' into iss62-protocol-integration