Add ol.DeviceOrientation
Add 'tracking' property to ol.DeviceOrientation
Add 'heading' property to ol.DeviceOrientation
Add options to ol.DeviceOrientation constructor
Replace 'changed' with 'change' (see #694)
Better device orientation example
Export ol.DeviceOrientation.SUPPORTED
Merge pull request #552 from fredj/deviceorientation

Add ol.DeviceOrientation