Standalone library build

[sjlynch]

Any chance this library could be built to run in a browser without needing requirejs, browserify, webpack, etc.? It is difficult for me to rapidly prototype something with this library due to the install requirements and this may be the same for other users. Threejs's build files are extremely convenient.

I understand you're busy so no worries if you don't have the time.

[sjlynch]

I got it working after using browserify, not too painful. Your lib works great! I got hundreds of trees (21k verts each) rendering with shadows and it runs beautifully! Thank you so much for implementing this! I only wish threejs supported easy instancing natively.