Snakeviz

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* Try loading JS libraries from a CDN in the web worker so that it can
be restarted even if the SnakeViz server has been shut down
(as happens when using the IPython magic).

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* Near-complete rewrite of SnakeViz for improved performance and usability
* Most of the computation and call-tree building now happens in the client,
once the page is loaded it is self-sufficient
* Display function info beside the sunburst instead of in tooltips
* Option to display the current call stack (useful when zooming)
* Controls for limiting depth of visualization and display of small functions

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* Fix display of functions in pstats table
* Sort pstats table on total time column be default

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* Switch to DataTables for table display
* Store all client assets in distribution for offline use

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* ``%snakeviz`` and ``%%snakeviz`` magics for IPython
* Python 3 support
* Fix for tooltips when the cursor is on the right side of the viz
* Remove use of the Bootstrap glyphicons