get relationships from meta object, not manager class; code tidy
get relationships from meta object, not manager class; code tidy

Ensembl/public-plugins,andrewyatz/public-plugins,muffato/public-plugins,muffato/public-plugins,andrewyatz/public-plugins,muffato/public-plugins,muffato/public-plugins,andrewyatz/public-plugins,andrewyatz/public-plugins,andrewyatz/public-plugins,Ensembl/public-plugins,Ensembl/public-plugins