clear old cached chunks
`chunkSize` and `cacheSize` options
0.0.2
Add `setup` argument for extending the shader
small tweak to glslGenerate()
0.0.3
Throw an error when using incompatible versions of voxel/voxel-engine
Fix cache handling
another slight tweak
Nicening up the demo
Merge branch 'master' into gh-pages
new demo