- added "test" for ulti-viewer dom insertion/removal to check for issues
that are not obvious in a stand alone demo
- regenerated embed with fixes for dom removal issues (see
https://github.com/usco/usco-asset-manager/commit/15ab9d3a063988e3869093d0e06130b8d95925df
and
https://github.com/usco/three-js/commit/c6fd163f7f7ba8108b9ee002537116e2082403c9)