Reddit integration

[jobachhu]

Create classes to analyze reddit data much like we are doing with twitter data. Instead of fetching data from twitter, I would just read local files generated by your reddit fetcher. You could then extract the commonly usable classes from the twitter.stats package into a new stats package, and implement them in both the twitter.stats package and a new *reddit.stats package. Most code should be usable for both use cases. Coordinate changes with @christian176 and @DavidStei, as they are working on the twitter part.