Set preserveDrawingBuffer in webgl and add example to freeze notebooks #52
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This PR makes the webgl contexts created by vispy set the
preserveDrawingBufferflag on creation, which may reduce flicker in some cases with many primitives drawing at once and allows for the canvas image to be manipulated in javascript in notebook environments, as demonstrated in the example that is added with the PR.It shouldn't be merged until vispy 0.7 is released with changes from vispy/vispy#1693 .