Fix TagModelExtensions::for_tagcloud to work with PostgreSQL.
Fix TagModelExtensions::for_tagcloud to work with PostgreSQL.

oktober/calagator,matthewkmayer/calagator,bencornelis/calagator,kerrizor/calagator,reidab/calagator,CorainChicago/ActivateHub,Villag/dentonator,oktober/calagator,jmcduffie32/calagator,shawnacscott/calagator,shawnacscott/calagator,alexbeeken/calagator.org,iamBalaji/Calagator,bencornelis/calagator,kerrizor/calagator,shawnacscott/calagator,Villag/dentonator,Eugator-Wranglers/calagator,Villag/dentonator,L2-D2/calagator,cp/calagator-1,dudleysr/calagator-workspace,Eugator-Wranglers/calagator,VolunteerOdyssey/calagator,L2-D2/calagator,jmcduffie32/calagator,jmcduffie32/calagator,CorainChicago/ActivateHub,dudleysr/calagator-workspace,nblackburn87/calagator,kerrizor/calagator,matthewkmayer/calagator,matthewkmayer/calagator,reidab/calagator,bencornelis/calagator,iamBalaji/Calagator,CorainChicago/ActivateHub,cp/calagator-1,L2-D2/calagator,iamBalaji/Calagator,nblackburn87/calagator,CorainChicago/ActivateHub,alexbeeken/calagator.org,kerrizor/calagator,matthewkmayer/calagator,oktober/calagator,iamBalaji/Calagator,shawnacscott/calagator,cp/calagator-1,eeeeeean/windchimes,jmcduffie32/calagator,L2-D2/calagator,reidab/calagator,cp/calagator-1,eeeeeean/windchimes,oktober/calagator,nblackburn87/calagator,VolunteerOdyssey/calagator,reidab/calagator,VolunteerOdyssey/calagator,bencornelis/calagator