add data visualization tool

[ewinston]

This converts result data to a pandas dataframe and starts a gui to visualize it.

resolves #9

[mtreinish]

Can you add some docs on how to use this to the README? I gave this a try using python -m report.interactive_viewer results and it opens the browser but doesn't seem to run a local webserver that it's trying to connect to. Then when I ran do anything and when I tried running under a jupyter notebook with:

from report.interactive_viewer import main
main("results/0029_bench.json")

the cell just returns and there is no output.

[ewinston]

To run it you do python report/interactive_viewer.py results/0029.json. I couldn't get the jupyter notebook to work unless I put a breakpoint in the script for some reason, which is how I ran when testing so I removed jupyter handling.