more matrix demo stuf
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added ack
Merge pull request #64 from sozforex/master

Support for python3 in server and extension for IPython shell execution visualization.
typo fix
updated ref
added a hideCode mode
added colored arrows for function calls and function returns
added tooltip on hover
added additional div for alternative visualizations on click
cleaned up holistic.js
cleaned up holistic.css
added static screenshot renderer
Update README.md