Introduced GraphObjectTypes which can be assigned to nodes to give them group properties for color, etc.
Fixed a bug which caused randomly assigned colors to change on filter events.

Reduced CPU-load by limiting the simulation time after node drag events.

Temporary fix for performance problems in Firefox (dragging nodes still creates memory leaks, but it does not automatically crash now).

Implemented configurable link width.

3DCSSSprites no longer block events from propagating to the scene controls, making zooming a much smoother experience.

Partially related to #8.