Added xsd:date, xsd:gYearMonth, xsd:gYear.
Fixed namespace on dctypes:Dataset
Suggested improvement on Dataset typing

I have updated the table of descriptions and the guidance notes to make it clearer how to type the various levels of dataset descriptions.
Passing W3C's HTML validation.
Updated with minor edits suggested by Michael Miller.
Fixed access pattern example (in text; appendix) #73
Commented out 'local.css' to pass W3C's CSS validation.
added section on including datasets in workflows
needed to add paragraph tags to text
added section on datsets in workflows.  fixed miscelleneous problems
Merge pull request #75 from mdmiller53/master

Added section on datasets in workflows. Passes W3C HTML validation.
add: clarification about the levels where conformsTo is used.
add: clarify that void:inDataset is for RDF distributions
add: void:inDataset points to an IRI of type void:Dataset
add: clarify where dataset types are valid