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This was completely hosed. plugin.xml was missing from the
build.properties file. The schema was incorrectly defined. The
XMLPersistenceProvider was not pulling from the extension points
correctly. I fixed this and tested it with a clean build.
Signed-off-by: Jay Jay Billings <billingsjj@ornl.gov>

I fixed the messed up provider id in the IJAXBClassProvider. I also
renamed the extension point and added documentation to the schema.
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>