If the identifier doesn't have "http://" for a FacultyDigitalArchive resource, set it as the citation before creating the Nyucore model
Add examples to the Resource specification for "pids" in cases where there are "handles" and URLs in the resource identifier.

When we select the "pid identifier", we prefer, in order
1. Handles - identifiers that start with the pattern "http://hdl.handle.net"
2. URLs - identifiers that start with the pattern "http://"
3. First identifier - if the identifier doesn't have a "handle" or a URL, use the first one we have
Implement the functionality for the "pid identifier" where we prefer "handles", then URLs and finally the first identifier we encounter
Allow SourceReaders to set the "pid_identifier" for Resources in cases where the source has a specific identifier that should be used for the "pid"