Added class explanation text
Added class explanation text

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