fixed #2244: cc.Camera.getEyeXYZ, cc.Camera.getCenterXYZ, cc.Camera.getUpXYZ return bad values.
Merge pull request #2716 from dumganhar/iss2244-getEye-develop

fixed #2244: cc.Camera.getEyeXYZ, cc.Camera.getCenterXYZ, cc.Camera.getUpXYZ return bad values.