Autosize the eaglview to adjust to the size of the EJJavaScriptView

Set's `autoresizingMask` to `UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth` on the `EJCanvasContext2DScreen`'s `EAGLView`, which auto-adjusts the size of the `EAGLView` when the frame of `EJJavaScriptView` changes.

Not sure how this is handled down in the JavaScript, maybe have an event listener for when the frame size changes?