REN-132 Added more nodetypes
REN-132 Add missing node type, skip unknown or unexpected elements
REN-132 Fixed tesselation
Catch file open errors
Compile fix
REN-132 Added FRN namespace elements, fixed duplicate vertex removal bug
Merge pull request #4 from 3dcl/bug/REN-132-fix-appearance-handling

Bug/ren 132 fix appearance handling