Added Gyroscope support

- CWPinchManager was moved to common
- Instead of sending a message itself, CWGestures now triggers a pinchswipe event. This event is picked up by the PinchManager, which in turn now sends the pinchswipe message
- When a pinch is detected by CWPinchManager, besides sending a pinch message locally, it now sends a wasPinched-typed message to the newly pinched remote. This message contains the device transformation of the pinched device.
- CWPinchManager now supports a isPinched() method that tells us if we are currently pinched to a master
- Added CWGyroscope, which uses the gyroJS library to get gyroscope and accelerometer data. For both, an event is triggered on each update (currently about once a second)
	- CWGyroscope is not used by CWPinchManager for now, working on it…