Implemented device polling
Merge branch 'master' of https://github.com/rainman110/TimeIT

Conflicts:
	src/de/dlr/sc/timeit/TimeITActivity.java
Merge branch 'master' of https://github.com/rainman110/TimeIT
Improved Login Window
Started on serial communication layer
Merge branch 'master' of https://github.com/rainman110/TimeIT