Adds appdirs support, fixes #13.
Merge branch 'release/v0.4.1' into develop
Fixes code example typo. Fixes # 16.
Adds note about appdirs requirement. Fixes #14.
Fixes typo in docstrings about serialization. Fixes #15.
Adds docs test environment to tox. Fixes #17.
Adds support for unicode keys. Fixes #18.
Adds unicode key note to docstring.
Bumps version to v0.4.2.
Updates change log.
Adds 2014 to copyright year.
Bumps version to v0.4.2.
Updates change log.

Merge branch 'release/v0.4.2'