Continued formatting of culling tutorial
Update of neighborhood calculation and new Patch 3D component
Added new geometry "Patch" to BVHRefiner.js
Implemented noBackendFound callback. Implements #129
Merge branch 'master' of github.com:x3dom/x3dom

* 'master' of github.com:x3dom/x3dom:
  Added new geometry "Patch" to BVHRefiner.js
cleanup of events examples (used Moveable)
Merge branch 'master' of https://github.com/x3dom/x3dom
changed second deltaT to constant multiplier
Implemented automated triangulation for all 9 mesh versions on Patch component of BVHRefiner
fixed update problem when inserting node, also did some performance opts and clenups
fixed render bug when switching shadowing off
another update fix as well as cleanups
even more cleanups
update in calculation of triangulation version in BVHRefiner
Text node volume update fix
Merge branch 'master' of https://github.com/x3dom/x3dom
cleanup of backend graph
Added documentation of BVHRefiner
added GL cleanup
Merge branch 'master' of https://github.com/x3dom/x3dom