Bump to v1.1

Based on the resources at https://dev.twitter.com/docs/api/1.1 --

* All resources are covered in `src/twitter/api/restful.clj` and `src/twitter/api/streaming.clj`
* All `GET` methods are tested in the test suite.

Please let me know if you find anything that needs fixing. I'm happy to contribute and make this solid; we'd like to use it in production at http://getlittlebird.com/ ... :)