Issue with WebAssembly memory

[kalwalt]

Sometimes i get this error while i run some Ar.js examples in the ES6 branch (PR AR-js-org/AR.js#116):

ARToolkit.js:1 Uncaught (in promise) RangeError: WebAssembly.Memory(): could not allocate memory at __webpack_modules__../node_modules/@ar-js-org/artoolkit5-js/dist/ARToolkit.js.w (ARToolkit.js:1) at ARToolkit.js:1 at new Promise (<anonymous>) at G (ARToolkit.js:1) at A.<anonymous> (ARToolkit.js:1) at a (ARToolkit.js:1) at Generator._invoke (ARToolkit.js:1) at Generator.next (ARToolkit.js:1) at A (ARToolkit.js:1) at i (ARToolkit.js:1)

I think that is caused because the lib is not compiled with the Allow memory growth option enabled: -s ALLOW_MEMORY_GROWTH=1
I will add this when the Ar.js ES6 branch is merged into dev.

[kalwalt]

solved with #12