Version 0.3.0

This is an api breaking release. It changes the api to use inheritance rather than decorators. This provides more clarity as to what is actually happening.

Instead of:

from class_only_design import class_only

@class_only
class MyClass:
    ...

You now do:

from class_only_design import ClassOnly

class MyClass(ClassOnly):
    ...

This release also adds autoname to the namespace class:

>>> from class_only_design import Namespace
>>> from class_only_design import autoname
>>> class NS(Namespace):
>>>     symbolic_handle = autoname

>>> NS.symbolic_handle
    'symbolic_handle'