- started toying with pub-sub system
 * for now uses polymer-signals
 * for now only testing for screenshot request(works)
and save/load request (not really implemented)

- various minor experiments with sub elements
- experimenting with pub-sub for screenshots requests (proto)
- minor cleanups and additions (rotation & scale support) for external
mesh importing
-added three.BufferGeometryUtils to experiment with performance enhancements using bufferGeometry
- small experimentation with performance using conversion
of imported shapes to buffferGeometry
- experimenting with dynamic (re) generation of shapes:
 * added experimental "properties" to all 3d and 2d shapes
 * added "attributeChanged" method to all classes as well (should
be named propertyChanged at this point)
 * combined with ui elements to set the propeties, this allows dynamically
updating the shapes
 * various related minor tweaks