Odin

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- Added a redesigned CSV codec Reader to address issues with handling row-by-row
processing and handling of row-level errors.
- Removed filter-query (moved to feature branch)

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- Added support for MultiPartField field type. A virtual field that allows for
the easy generation of key values composed of several other fields.
- Documentation updates and some initial type hints added (using :type... style)
- Allow a virtual field to be identified as a key
- Introduce a common base class for ALL field types, this allows them to be identified
separately via hash (for sorting and keys)
- Tweaked the new string.empty option so by default it behaves in the same way as
it was previously defined (eg null assumes empty)

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- Possible breaking change with date and time serializers, they no longer apply
a timezone as this is expected to be managed by date and time fields.
- Added getmeta tool for getting meta data.
- Changes to Resource/Meta options to allow for them to be overridden.
- Fixes regarding ResourceBase/Resource changes

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- Fixed bug preparing naive date and time values.

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- Support for multipart keys.
- Support for naive dates and times.
- Boolean fields now accept y/n as truthy
- Change of Resource iterable base class

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- Migrated all tests to py.test
- Support for Python 2.6 for _most_ features (some contrib features are not supported
see docs for detail)