The data can not more than 32768 nodes？

[fahaizhong]

I try to draw a Force-directed Graph. When I have 32769 nodes, I got a error:
WebGL: INVALID_VALUE: texImage2D: width or height out of range.
When the nodes change to 32768.No error.

[JackieAnxis]

I met the same problem and fixed it with PR #17