added database function which inherits from hub database
added database function which inherits from hub database

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