Added retweet functionality, and swapped app.
Added cache expire back in.
Removed cache from production. Note to self: do this an env var or something less ridiculous.
Update to secure rubygems source
Moved Tweet fetching/updating to a background command

* Removed sinatra/cache in favour of just using Dalli::Client
* Made scripts to do the tweet updating
* Updated Readme instructions
* Added retrying to the Twitter seearch API