Closes #297 array of images

simplify test

Closes #296 adds image support

```js
var imageKernel = gpu.createKernel(function(image) {
const pixel = image[this.thread.y][t...

Add documentation for sharing canvas and contexts.

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Support for the do-while construct

Fix doc typo

doxdox rocks

261 - webgl2

272 increase performance on framebuffers

make uniforms only set if their values indeed change, and add tests

272 kernel performance

fix, test, bump version number, and make.

and fix reference to my hasty change from `setupOutputTexture` to `_setupOutputTexture`

they are all passing, but just trying to try every combination

fix #267 by refining implementation a bit

fix #259 by handling when atan2 is used directly in the interpreter

also add unit tests ensuring resolved

263 - get toString working correctly again

255 - implement new option to prevent overwrite of output texture

[man of war](https://en.wikipedia.org/wiki/Portuguese_man_o%27_war)

resolve logic for #236

propose changes for fix how floating values are handled

Fix floatOutput in createKernelMap

replace ast with correct variable name and some inline documentation correction
bump version number

remove unused variable
bump version number

Also, I got tired of typing commands for building, so I added on to npm scripts, `npm make`

I was able to unify the FunctionNodeBase.astMemberExpressionUnroll for reuse in both CPU and WebG...