[Twitter] Use `id_str` as user identifier to prevent issues with MongoDB
Don't use alias function & force default values for `http_build_query()`
Use Buzz interface data instead of hardcoded strings for HTTP methods
Additionally small cleanup
Add CHANGELOG notes
Merge pull request #295 from stloyd/bugfix/twitter_id

Twitter bugfix + cleanups
Prepare release 0.2.5
Merge branch '0.2'