add event listening for elements, enhance debug stuff
fix numeral spacing in example
use document to listen for events
add color to debug outlines
fix toroid behavior
add event example with spaceship
separate examples
allow external control of stage update/draw
Merge branch 'events' into nested, create nested stage element

Conflicts:
	examples/example.js
	src/stage.js
fix nested stage scaling
add moveTo to clock example
use correct scaling of nested stage
fix debug element outline
merge nested into events
update README and clock example
Merge branch 'master' of github.com:zjmichen/henri