Expose the light position so that it can be modified.

Conflicts:
	js/isomer.js
Made light position available to constructor via options argument
Merge pull request #3 from rcmaniac25/fix/expose-light-angle

Expose the light position so that it can be modified
added colored lighting
Merge branch 'master' of github.com:jdan/isomer

Conflicts:
	js/isomer.js