materialgen: WIP work.
Merge branch 'master' of github.com:acgessler/medea.js
vertexbuffer: fix bug that caused VAOs to be repeatedly re-generated because the _vao_attrmap member was not written.
vertexbuffer: check for object identity first when comparing attribute maps.
material: use classical for loop instead of forEach() because the closure is measurably slow in V8.
filesystem: add do_not_load parameter to Resource constructor.
material: do not delete members, just null them to avoid changing hidden class.
Merge branch 'master' of github.com:acgessler/medea.js