Update README with info regarding location of project now on GitHub
Updates to documentation layout and addition of quick links
Reformat documentation index
Updated doc_gen to be a bit easier to integrate with existing templates, added support for generating HTML
Fix issue causing Resource to be listed as a parent (from Django models). Issue is a side effect of using six to provide python 2.7 and 3 compatibility.
Fixed check that allows a Resource object to be passed in place of a resource name.
Fix help text display
Fix pep8 issue
Add doc_group meta option to resources, tidy up of meta option definition.
Updated documentation to include all resource meta options.

The new doc_group property is a grouping option for generation of documentation.
Implemented required field check when creating resources, this also has the side effect of supporting an extra_attrs method that is called on resources if there are any attributes left over during parsing.
Added required entry to default_error_messages
Fixed error messages unit tests (broken for addition of a new error message)
Improve the way missing fields are handled, use the NOT_PROVIDED class to do this.
Updated null,blank and required meanings and code that uses them
Use first item in choices tuple.
Set default item to be an instance of the "of"
Improvements to documentation generation, addition of choices.
Renamed of field to resource as it is makes more sense in when in use
Added datetimeutil, a module that handles datetime conversion between python datetime objects and strings formatted to the standard specified in ECMA-262
Added support for DateTime objects