Enable update and render state methods
Add demo update
Merge branch 'master' of github.com:orbitalimpact/opal-phaserjs

* 'master' of github.com:orbitalimpact/opal-phaserjs:
  used the `spritesheet` load method, instead of `image`
collect stars and score
Merge branch 'master' of github.com:orbitalimpact/opal-phaserjs

* 'master' of github.com:orbitalimpact/opal-phaserjs:
  removed some semicolons

Conflicts:
	demo/app/main.rb