Add heading setter for 2D and Columbus view.
Add set heading for 3D and get heading for all scene modes.
Add get/set tilt to camera controller.
Add tests for get/set heading.
Add tests for get/set tilt.
Update CHANGES.md.
Remove commented out code.
Merge branch 'master' into headingTiltRoll

Conflicts:
	CHANGES.md
Remove camera related functions and replace them with ES5 properties.
Merge pull request #1131 from AnalyticalGraphicsInc/headingTiltRoll

Heading Tilt
Fix doc typo
Merge branch 'master' into gltf