Show users sorted by favs and retweets
Speed up user sorting
Removed concept of faved RTs

* The favorites API call returns all original tweets
Clean up TweetersController#show logic
Move tweet counting logic to Tweeter model
Dedupe tweeter counting

* Extract most of the logic from Tweeter#most_favorited_tweeters and
  most_retweeted_tweeters into Tweeter.timeline_tweeter_count
* Remove Tweeter#sort_count_hash
Clean up TweetersController#show a little
Merge pull request #2 from jakeboxer/calculate-favorite

Count most favorited and retweeted users