Convert defaultdict to dict in to_dict() function
test renamed
Add a bit more tests of time parsing
time & timedelta support added
timedelta arithmetic operations in queries
Entity instance status renamed: 'updated' -> 'modified'
Split entity instance status: 'saved' -> 'inserted'/'updated'
Fixes #58: New hooks after_insert, after_update, after_delete
Fixed bug with infinite recursion in before_insert hook
Fixes #70: "EntitySet allows to add and remove None"
Renaming: SetWrapper -> SetInstance
Renaming of internal method: attr.check() -> attr.validate()
An ability to specify custom attribute validators using the 'py_check' parameter: age = Required(int, py_check=lambda age: age >= 0 and age < 120)
minor change
Merge branch 'master' to 'orm'
Update documentation
Update CHANGELOG.md
Change Pony ORM version: 0.5.4-dev -> 0.5.4
Pony ORM release 0.5.4