Enable the ability to create a WebGL rendering context with options

[nkreeger]

The current method for creating a WebGL session createWebGLRenderingContext() simply tries to default a WebGL EGL/GL context and session with the best options. It would be nice to allow for specific versions and potentially extensions to be enabled/disabled at creation.

[innerop]

Sane defaults are preferred for beginners, so would love to keep this convenience (many of us are interested in using this for DL tasks with TF.js, and have no clue about WebGL specifics) -- I agree that advanced users should be able to define.

I would love to see TF.js users being the primary target audience with the general GL audience being served, too, but not at the expense of TF.js audience. May be hard to address two audiences but splitting along the lines of beginner and advanced is reasonable, IMO. My $0.02

[nkreeger]

Sure - this package will be an dependency to a TensorFlow.js backend integration. The focus on this library is to provide headless GL ES/Compute Shader functionality to Node.js.

[AlexVestin]

Adding width & height to the options would be great

[nkreeger]

@AlexVestin just published 0.0.14 of node-gles w/ your changes