gets the rid param properly in case there are more than one url parameters
gets the rid param properly in case there are more than one url parameters

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