Status api

Adds supports for the following methods from twitter:

- retweets: Show the number of retweets of a tweet up to 100.
- show: Get information for a given tweet.
- destroy: Delete/destroy a tweet.
- update: Send a new tweet.
- retweet: Retweet a given update.

To test it you can use D-Feet to access the Dbus methods and perform the diff operations. The code needs some clean up that is coming in a diff branch simply not to block other development.