Document that :add_resource_set is one of the default before_load methods
Remove the DublinCoreAsset since it doesn't seem to be used anywhere
Remove NyucoreMetadata since it doesn't seem to be used anywhere
Add the NyucoreMetadata::Vocabulary spec and implementation

The NyucoreMetadata::Vocabulary is for use with the Ichabod::NyucoreDatastream and is intended encapsulate the NYU Core vocabulary terms so that we can move them out of Ichabod at some point. We use the NyucoreMetadata namespace only because Nyucore is taken at the moment.
Add the Ichabod::Vocabulary spec and implementation

The Ichabod::Vocabulary defines terms that are specific to the Ichabod application, e.g. :resource_set.
Add the Ichabod::NyucoreDatastream spec and implementation

Use the NyucoreMetadata::Vocabulary and the Ichabod::Vocabulary when defining the Ichabod::NyucoreDatastream to encapuste abstractions.
Nyucore::Metadatum takes an Ichabod::NyucoreDatastream

Nyucore::Metadatum takes an Ichabod::NyucoreDatastream instead of an NyucoreRdfDatastream, which will be removed.
The Nyucore model uses the Ichabod::NyucoreDatastream instead of the NyucoreRdfDatastream
Update the Nyucore field constants

The updated constants are aggregated in the FIELDS constant and include the :resource_set attribute. The constants that make up FIELDS are NYUCORE_FIELDS, EXTRA_SINGLE and EXTRA_MULTIPLES. SINGLE_FIELDS and MULTIPLE_FIELDS are also defined for convenience.
Update the VCR cassettes for the Nyucore model spec

The cassettes changed because the datastream name changed. The "reset resource_set" VCR cassette was also added.
Add the resource_set attribute to the Nyucores factory
Use the Nyucore::FIELDS aggregation constant in the NyucoresHelper
Before load of a ResourceSet::Base, add the ResourceSet name to the Nyucore model
Re-record VCR cassettes to add :resource_set for the ResourceSet::Base spec
Update ResourceSet README to indicate change of instance method name to #load
Change the name to of the ResourceSet::Base instance method to #load

Change the name to of the ResourceSet::Base instance method from #create to #load since what it's really doing is loading (and re-loading) resources to Fedora.
Call resource_set.load in the Ichabod::DataLoader
Update resource set specs based on changes to ResourceSet::Base
Don't map the Rosie the Riveter collection name to the Nyucore series attribute
Add the Rosie the Riveter matcher to the Nyucore::Collections