Adding new contributors to this release
Added Laura Arjona to AUTHORS.

I'm not sure what all translators are there, but for sure Laura has
done a lot ;)
Documenting most of the the many new features in the release notes.
Committing present MediaGoblin translations before pushing extracted messages
Committing extracted and compiled translations
MediaGoblin v0.4.0!
Merge branch 'master' of git://gitorious.org/mediagoblin/mediagoblin