removed RichText parent class from ref_ts model to make it build with django inplace editing
removed RichText parent class from ref_ts model to make it build with django inplace editing

ResearchSoftwareInstitute/MyHPOM,hydroshare/hydroshare,RENCI/xDCIShare,FescueFungiShare/hydroshare,FescueFungiShare/hydroshare,ResearchSoftwareInstitute/MyHPOM,FescueFungiShare/hydroshare,FescueFungiShare/hydroshare,ResearchSoftwareInstitute/MyHPOM,ResearchSoftwareInstitute/MyHPOM,hydroshare/hydroshare,hydroshare/hydroshare,RENCI/xDCIShare,ResearchSoftwareInstitute/MyHPOM,hydroshare/hydroshare,RENCI/xDCIShare,RENCI/xDCIShare,FescueFungiShare/hydroshare,hydroshare/hydroshare,RENCI/xDCIShare