Merge tag '0.3.22' into develop

Released 0.3.22 0.3.22
bugfixes for entry locale and related entry fetching
added order field
fixed creating proxy with invalid id
fixed entry collection, added collect function to GenericModel, implemented query argument for the find methods
added nested properties support to the slug behaviour
added unlink method to prepare an entry proxcy for serialization
bumped version
Merge branch 'release/0.4.0'