Dictobj

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* Support for Python 3 added.
* Removed the capabilities for <, >, <=, and >= on the
`DictionaryObject` to get Python 3 support properly added.

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* Fixing the setup.py script so it works on older versions of Python.

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* Added `DictionaryObject.asdict()` to return a copy of the internal
data as a `dict`, because some external libraries may require one
and won't accept a `DictionaryObject`.
* Added another test to some older doctest code to make sure
`MutableDictionaryObject.__setitem__` works correctly.
* Improved release.sh a little bit for generating pypi packages / docs.
* Upgrading development status to "Production/Stable".

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* Added `__setitem__` to `MutableDictionaryObject`.

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* Properly formatted README.md and added some details about how
to contribute to this project.
* Added doctests to this project since the examples actually do
work as valid tests taht can be run. Found some bugs, resolved
them, and added everything to the automated testing suite.
* Changed CHANGELOG to CHANGELOG.md.

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* Adding the source code URL to the README so that it's easier
for people to find and help contribute.