Dictobj

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* Changelog started and prior versions added to this file.
* Removed some code from `MutableDictionaryObject.__setattr__`
that is no longer needed now that `DictionaryObject.__init__`
properly handles initialization of `__dict__` when passed in a
`DictionaryObject`.

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* Improved the thoroughness of the documentation.
* Added a description for PyPi.

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* Fixed equality operators and the comparison method.
* Fixed object copying when passing in another `DictionaryObject`.
* Fixed handling of default values upon `__init__`.
* Added `__setstate__` / `__getstate__` so pickle now works correctly
with the classes.
* Fixed error reporting on exceptions.
* Improved `__repr__` so it gives a proper string represenation of
our classes so they can later be eval'd.
* Added more unit tests:
- `test_pickle`
- `test_copy`
- more equality tests
* Added more examples to the documentation.

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* First release.