- lot of cleanup and enhancements
 * seperated (and correctly updating) three.js stats viewer into a different element
 * stats get updated by the three-viewer directly
 * also added experimental overlay controls (also an element , not functional for now), and its dependencies (font awesome)
 * starting to get a better grasp over various aspects of polymer.js : quite like it ! (added conditional display of stats and overlay controls)
 * cleaned up code of three-viewer : seperated .js files also cleaned up, experimented with best way to pass complex (ie objects) params
 * added combined camera control, with autorotate etc
 * various minor cleanups and experiments