Create master data object
Nodes register, edges still in progress
Add Node class
Edges have ids
Add edge model
Master data references set to _nodes and _edges
getting force layout to work with new data model
Merge branch 'experimental' of github.com:ifjorissen/Alchemy into ifjorissen-experimental

Conflicts:
	app/scripts/alchemy/core/drawedges.coffee
	app/scripts/alchemy/core/updateGraph.coffee
	app/scripts/alchemy/drawing/drawNodes.coffee
Merge branch 'ifjorissen-experimental' into v0.2

Conflicts:
	app/scripts/alchemy/core/layout.coffee
	app/scripts/alchemy/drawing/drawNodes.coffee