Minor modifications to be used by the new classes
Navigation system based on shortest paths and closest dirty cell first created
Fixed #12
Fixed #17
Controller Class referenced Sensor instead of RoomSensor
Shortest path algorithm corrected and improved
Method to return to charging station implemented
floorplan.xml file corrected

close #14
fixed #17
Fixes #27
Class file changes
Merge branch 'movimentation'

Conflicts:
	bin/Sensor/RoomSensor$Cell.class
	bin/Sensor/RoomSensor.class
	src/Sensor/RoomSensor.java
Merge between Movimentation and Master