Rss

My bad for submitting an incomplete pull request earlier.
Everything should work for rss except that the posts aren't interleaved with each other.
This is because the date time are in different formats, so it can't sort:
For RSS, the format is :posted_at=>Fri, 31 Jan 2014 19:10:34 UTC +00:00
For Twitter posts, the format is :posted_at=>2014-02-02 12:56:16 -0800
I took those values from the database.
I searched the entire app for instances of "datetime" and all I found was this crazy javascript thing which is in the /coverage directory. Whoever set the datetime stuff hopefully knows how to fix this.