Merge pull request #71 from matbe/master

Removing unnecessary parameter from append statement.
Updating transifex server URL.
Setting the installed version of python-magic to current HEAD.

- Solves magic.MagicException: no magic files loaded
- https://github.com/ahupp/python-magic/issues/44
Merge pull request #74 from mbehrle/fix/v0.13.1

Fix/v0.13.1
Changing length of field mimetype to 255 chars.

According to
http://www.iana.org/assignments/media-types/media-types.xhtml
the length of mimetypes currently can be up to 85 chars, so with 255 we
will be safe.
Merge pull request #75 from mbehrle/fix/v0.13.1

Changing length of field mimetype to 255 chars.
Adding some more MIME types for ODF.

According to http://plan-b-for-openoffice.org/glossary/term/mime-type
Merge pull request #76 from mbehrle/fix/v0.13.1

Adding some more MIME types for ODF.