Modified DB model for our new movie relationships system.
Table users: renamed "avatar_hash" to "avatar_name" and added "avatar_changed".
Fixed seed data.
Migrated Movie and Movies to the Data namespace and reviewed them.
Changed all the language or country queries in Movie to use I18n instead of querying the tables directly.
Comment cleanup in I18n.
Migrated MoviePoster, MovieImage, Rating and Releases to the Data namespace and reviewed them.
Minor ternary conditional fix in Movie.
Modified FileSystem::unlinkRecursive() to consider files that don't exist in the first place.
Added test case for aforementioned method.
Merge origin/master