[infinispan-dev] duplicate classes in api and common modules

Hi, Several identical classes are duplicated in both common and api modules. "mvn install" still works, but the (some) IDEs have problems building Infinispan. This patch[1] removes them from the commons module, as this one already depends on the api module. The classes are: -AdvancedExternalizer -Marshaller -Externalizer Cheers, Mircea [1] https://github.com/infinispan/infinispan/pull/631