few error handling fixes
finally make the heirarchy viewer collapse the children
added undo manager!
add undo. Fix ctrl interfere with avatar motion. re-allow users to create avatars on worlds they don't own. Fix bug in xapi that killed the server.
remove console.log call
add profiler
add look profiler to package.json
small fix for undefined as property value for undo
typo in loadmesh
add settings page. Require users to do the compatibility test. Update header bar on main page
some love on the inventory gui, which was throwing errors left and right
finally fix long standing issue with 3DR integration. Clients can now load any model that the server account has access to.
hook up a few more things to the undo system. MAke the heirarchy manager update when changes occur
fix some drama with the spline tools.
serve special case worlds from examples folder
Fix for testing Max Anisotropy extension.

Checking for EXT, MOZ, WEBKIT extensions
make sure to show scrollbars on open, close of heirarchy items
small fix to autocomplete. no longer disappears on first display, typing really fast does not hide it
add more examples. Fix video material
Merge branch 'development' of https://github.com/adlnet/Sandbox into development