nodeClick functions work
edgeClick functions work
edgeClick defaults to null
Merge branch 'click_functions' of https://github.com/nunayerBeezwax/Alchemy into nunayerBeezwax-click_functions

Conflicts:
	app/scripts/alchemy/core/interactions.coffee.md
Merge branch 'nunayerBeezwax-click_functions' into release-0.4.1