Changes for non service document entity added 

1. One more constructor added in AbstractODataCommand to pass MetadataOData4j object - this change also required change in spring bean.
2. few ore functions added in MetadataOData4j class to get EdmEntitySet. GETEntitiesCommand, GETEntityCommand and producer will use these functions.
3. Fixed unit test according to above changes
4. Code cleanpup - removed dead code and commented code