Events implemented. Done!

Used now by scrollbar.
Event improvements
Fixed mouse up issue
button sends message on state change.
toolbar handles button events and updates state
cleaning up scrollbar to make variables local (and adding ';')
adding arbitrary 'retrieve' to luna_scene
taking out tool and replacing with guiChildren
replacing tabs with two spaces
adding bare bones slider
added rotate/translate to render.
added spinner and test.
Fix some draw stuff
Highlight focus
adding image support to spinner.
adding spinner image to index.
updating todo
Merge branch 'master' of https://github.com/rchoetzlein/luna

Conflicts:
	index.html
Merge branch 'master' of https://github.com/rchoetzlein/luna
fixing event creation and testing custom callbacks.