Merge branch 'release/0.2.0' into develop
Allow add_person to set the nickname.
person_exists should accept other arguments.
Merge pull request #12 from fedora-infra/feature/nickname-setting

Allow add_person to set the nickname.
Allow getting a user by id and nickname.
Merge pull request #13 from fedora-infra/feature/nickname-getting

Feature/nickname getting
Fix typo.
Update link to Tahrir in readme.
Stop leaking sqlalchemy sessions.  Fixes #14.
Merge pull request #15 from fedora-infra/feature/stop-session-leak

Stop leaking sqlalchemy sessions.  Fixes #14.
PEP8.
0.2.1
Merge branch 'release/0.2.1'