twitter-compatible API: /statuses/retweets_of_me.json

[carols10cents]

This is a smaller story broken out from #562.

This issue is just to make /statuses/retweets_of_me.json work like the twitter API. This route doesn't currently exist at all, but there is a nice update json decorator for you to use.

Ignore the issue of client authentication for the moment; just make this work as a normally authenticated user in the browser for now (see #564 about authentication)

https://dev.twitter.com/docs/api/1/get/statuses/retweets_of_me

Description: Returns the 20 most recent tweets of the authenticated user that have been retweeted by others.

Definitely interpret anything in the twitter docs so that it makes sense for rstat.us, and definitely ask if you have any questions!

Leave a comment if you're working on this.