Merge branch 'gyrorange'
Add new option to set number of degrees tilt needed for full range. Will give get back some of the functionality that was lost when restricting gyro to same range as desktop by using wider range of tilt, and by setting a larger range of object motion.

Also fixes the options handling in enable() so they aren't set every update, but only once.
Merge pull request #44 from magebarf/23149235756df254dde885d4fbccab1679a93ad7

Configurable degrees of tilt for gyro parallaxing