Feature request: export report

[gregschwartz]

Awesome work, thank you!! Just made an analysis of emoji use with a friend much easier.

A few stacked feature requests:

1. Would be great if there was a way to export the word frequencies to CSV
2. Better yet, a word frequency of just emoji would be particularly useful
3. Would be nice to export the graphs to PNG or GIF as well, but that's easier to screenshot.
4. Finally, a report of overall emoji use for me -> anyone, and anyone -> me, would be of interest.

Thanks again for the great tool!