- added "sensible defaults" for renderer and viewport (basic):
 * when no renderer and no viewport/controls/camera was added at
domReady, they get automatically inserted
 * still needs a bit of polish
- fixed positioning issue of cameras (their position was not set at all)

- slight css cleanup and improvements:
 * removed useless css
 * added slight fade-in
 * manually adding [resolved] attribute to element at domReady event to
reveal the element (FOUC prevention)