XMLPersistenceProvider persists our data structures. 

1. Added IJAXBClassProvider and ICEJAXBClassProvider implementation.
This interface exposes a getClasses() : Class[*] method that can be used
by the XMLPersistenceProvider to expose all relevant Classes when
creating the JAXBContext. 
2. Added registerClassProvider() method to XMLPersistenceProvider and
exposed it to the OSGi DS so that IJAXBClassProviders can be added and
used during XML persistence. 
3. Updated the Form JAXB annotations to not directly reference Component
realizations. 
4. Implemented tests for this new functionality and updated all tests
affected by this.



Signed-off-by: Alex McCaskey <mccaskeyaj@ornl.gov>