started incorporating feeds into application

- added "feeder" bundle to project
registered feed bundle
Added RSS 2.0 feed generation

- new tweetdata.php base class
-- includes tweets based general queries.
-- added Tweetdata_Controller to start.php
- modified routes.php
- added feed.php which generates rss2 feed
- minor css changes
- added new transparent favicon
- added new "logo" for use with feed