Update Viewarea.js

_transMat and _rotMat examine matrices replaced by single transformation matrix _relMat that is relative to current viewpoint.

_movement vector was not needed any more, so it was removed.

New methods for navigating avatar added, namely: orbitV(), orbitH(), zoom(), pan(), rotateV() and rotateH().
Update Runtime.js

Viewarea _transMat and _rotMat matrices replaced by _relMat, unused _movement vector removed.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/Viewarea.js
Update Runtime.js

Viewarea "_transMat" and "_rotMat" matrices replaced by "_relMat" matrix, unused "_movement" vector removed.
Update Viewarea.js

"_transMat" and "_rotMat" matrices replaced by single transformation "_relMat" matrix that is relative to current viewpoint. Unused "_movement" vector removed.

New methods for navigation added, namely: orbitV(), orbitH(), zoom(), pan(), rotateV() and rotateH().
Merge pull request #166 from stepasite/master

Examine mode transformation matrices of viewarea reworked