Rename exception message: "An attempt to mix objects belongs to different caches" -> "An attempt to mix objects belonging to different transactions"
Add doc example of obj.get_pk()
Add min, max attribute parameters description to doc
update .gitignore
add doc theme
Merge branch 'master' to 'orm'
Fixed bug in query.show() method which was failing when the entity had only one attribute
Merge branch 'master' to 'orm': bugfix
Fixes #80: "Entity NoneType does not belong to database" when using to_dict
Merge branch 'master' to 'orm': bugfix
Fixes #75: MappingError for self-referenced entities in a many-to-many relationship
Merge branch 'master' to 'orm': bugfix
Change Pony ORM version: 0.5.4 -> 0.6-dev
Forward compatible cmp function
Forward compatibility for basestring
Small refactoring
Forward compatible int_types (int, long) or (int,)
Forward compatibility for long type
Forward compatibility for builtins
Get rid of StrConverter, use UnicodeConverter for str type as well as for unicode type