Need appropriate ontology classes for OSF objects

[karenhanson]

Many of the OSF types were not easily mapped to existing ontologies. Before connecting the harvester to production RMap, we need to figure out what to replace these types with. Currently made up URLs are used. Specifically, these lines point to the code that is problematic:

rmap-loader-osf/rmap-loader-osf-transformer/src/main/java/info/rmapproject/loader/osf/transformer/OsfNodeDiscoTransformer.java

Lines 65 to 71 in f53a082

	protected static final String OSF_TERMS_PREFIX = "http://osf.io/terms/";
	/** OSF Registration ontology term. */
	protected static final String OSF_REGISTRATION = OSF_TERMS_PREFIX + "Registration";
	/** OSF Project ontology term. */
	protected static final String OSF_PROJECT = OSF_TERMS_PREFIX + "Project";