Parker

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- Add tracking of visited URIs as well as page hashes to the
crawl worker. Use that to reduce the number of URIs added to
the crawl queue.

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- Fix an issue with the order of key-value reference resolution
that prevented the effective use of unique_field if using a
field that was a kv_ref.

- Add some Parker specific configuration so we can specify where
to download, in case the PROJECT env variable doesn't exist.

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- Update ConsumeModel to post process the data. This enables us to
populate specific data from a reference to a key-value field.

- Reorder changes so newest first, and rename to "Changes" in the
long description.

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- Bug fix to fix RST headers which may be the problem.

- Remove the decode/encode which is not the issue.

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- Bug fix to see if RST in ASCII fixes issues on PyPI.

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- Added handling for a PARKER_CONFIG environment variable, allowing
users to specify where configuration files are loaded from.

- Added the ``parker-config`` script to install default configuration
files to a passed location. Also prints out an example PARKER_CONFIG
environment variable to add to your profile files.

- Updated documentation to use proper reStructuredText files.

- Add a CHANGES file to track updates.