The recent changes caused, for some unknown reason, the
ReflectivityModel Item to no longer receive the IMaterialsDatabase
service. This addresses that problem by catching the service in the core
and reconfiguring the XMLMaterialsDatabase to register directly with an
activator.

Signed-off-by: Jay Jay Billings <billingsjj@ornl.gov>

Added extension points for IJAXBClassProvider and ICompositeItemBuilder.
Added IceJAXBClassProvider as extension.

Signed-off-by: Nick Stanish <nickstanish@gmail.com>

Added extension points for IReader, IWriter, and IPersistenceProvider.
Added extension capability to MooseFileHandler and
XMLPersistenceProvider

Signed-off-by: Nick Stanish <nickstanish@gmail.com>

Extension Point and Extensions
 
Signed-off-by: menghan <menghanli723@gmail.com>

Added extension capability to remaining implementations of ItemBuilder

Signed-off-by: Nick Stanish <nickstanish@gmail.com>

Signed-off-by: Nick Stanish <nickstanish@gmail.com>

Signed-off-by: Jay Jay Billings <billingsjj@ornl.gov>

Committing current work to branch regarding yaml file generation from
eclipse toolbar. 
Signed-off-by: Alex McCaskey <mccaskeyaj@ornl.gov>