Remove unused function
Add missing description for @return tag
Merge pull request #634 from elemoine/missing-description

Add missing description for @return tag
Merge pull request #635 from elemoine/handletilechange

Remove unused function
Add ol.DeviceOrientation
Add 'tracking' property to ol.DeviceOrientation
Add 'heading' property to ol.DeviceOrientation
Add options to ol.DeviceOrientation constructor