fixed throttel usage
Added Arduino_Acquisition class.

Communicates with Arduino devices.
Added Data Acquisition Unit abstract class.
Fixed EOL to Unix standard.
Added DAU comments and fixed the messaging system.
Arduino_Acquisition now inherits DAU class.
Fixed typos and indentation issues in DAU Class.
Fixed typo in Arduino class.
Added DAU to core package.
Fixed typo for measurement type key.
Merge branch 'master' of github.com:ami-lab/AmI-Platform into f/#172-scale-canvas-and-positions-to-room-size