Refactor slug creation functionality out of ``Displayable`` model into ``Slugged`` model.
Refactor slug creation functionality out of ``Displayable`` model into ``Slugged`` model.

adrian-the-git/mezzanine,biomassives/mezzanine,SoLoHiC/mezzanine,wbtuomela/mezzanine,dovydas/mezzanine,ZeroXn/mezzanine,scarcry/snm-mezzanine,batpad/mezzanine,orlenko/sfpirg,jerivas/mezzanine,jerivas/mezzanine,guibernardino/mezzanine,PegasusWang/mezzanine,dekomote/mezzanine-modeltranslation-backport,viaregio/mezzanine,Skytorn86/mezzanine,batpad/mezzanine,spookylukey/mezzanine,orlenko/plei,eino-makitalo/mezzanine,cccs-web/mezzanine,jjz/mezzanine,SoLoHiC/mezzanine,viaregio/mezzanine,geodesign/mezzanine,Cicero-Zhao/mezzanine,molokov/mezzanine,emile2016/mezzanine,orlenko/plei,joshcartme/mezzanine,Kniyl/mezzanine,PegasusWang/mezzanine,ryneeverett/mezzanine,douglaskastle/mezzanine,cccs-web/mezzanine,jjz/mezzanine,damnfine/mezzanine,ZeroXn/mezzanine,fusionbox/mezzanine,frankier/mezzanine,ZeroXn/mezzanine,joshcartme/mezzanine,wrwrwr/mezzanine,emile2016/mezzanine,gbosh/mezzanine,sjdines/mezzanine,orlenko/sfpirg,spookylukey/mezzanine,frankchin/mezzanine,douglaskastle/mezzanine,frankchin/mezzanine,tuxinhang1989/mezzanine,douglaskastle/mezzanine,dustinrb/mezzanine,molokov/mezzanine,dekomote/mezzanine-modeltranslation-backport,dsanders11/mezzanine,stbarnabas/mezzanine,gradel/mezzanine,dovydas/mezzanine,christianwgd/mezzanine,orlenko/sfpirg,Cicero-Zhao/mezzanine,Skytorn86/mezzanine,industrydive/mezzanine,fusionbox/mezzanine,scarcry/snm-mezzanine,christianwgd/mezzanine,nikolas/mezzanine,orlenko/plei,stephenmcd/mezzanine,dovydas/mezzanine,damnfine/mezzanine,sjdines/mezzanine,mush42/mezzanine,mush42/mezzanine,emile2016/mezzanine,theclanks/mezzanine,Cajoline/mezzanine,frankier/mezzanine,jjz/mezzanine,AlexHill/mezzanine,eino-makitalo/mezzanine,geodesign/mezzanine,dsanders11/mezzanine,Cajoline/mezzanine,dustinrb/mezzanine,christianwgd/mezzanine,geodesign/mezzanine,wyzex/mezzanine,webounty/mezzanine,frankier/mezzanine,sjuxax/mezzanine,nikolas/mezzanine,saintbird/mezzanine,dustinrb/mezzanine,readevalprint/mezzanine,nikolas/mezzanine,jerivas/mezzanine,dsanders11/mezzanine,vladir/mezzanine,readevalprint/mezzanine,biomassives/mezzanine,saintbird/mezzanine,stephenmcd/mezzanine,joshcartme/mezzanine,wbtuomela/mezzanine,readevalprint/mezzanine,mush42/mezzanine,PegasusWang/mezzanine,wbtuomela/mezzanine,vladir/mezzanine,wrwrwr/mezzanine,industrydive/mezzanine,SoLoHiC/mezzanine,tuxinhang1989/mezzanine,gbosh/mezzanine,promil23/mezzanine,guibernardino/mezzanine,viaregio/mezzanine,agepoly/mezzanine,sjuxax/mezzanine,agepoly/mezzanine,molokov/mezzanine,Kniyl/mezzanine,eino-makitalo/mezzanine,gradel/mezzanine,webounty/mezzanine,wyzex/mezzanine,biomassives/mezzanine,stephenmcd/mezzanine,frankchin/mezzanine,Cajoline/mezzanine,agepoly/mezzanine,scarcry/snm-mezzanine,saintbird/mezzanine,Skytorn86/mezzanine,industrydive/mezzanine,adrian-the-git/mezzanine,Kniyl/mezzanine,promil23/mezzanine,dekomote/mezzanine-modeltranslation-backport,AlexHill/mezzanine,webounty/mezzanine,ryneeverett/mezzanine,gbosh/mezzanine,stbarnabas/mezzanine,wyzex/mezzanine,ryneeverett/mezzanine,sjuxax/mezzanine,sjdines/mezzanine,spookylukey/mezzanine,theclanks/mezzanine,vladir/mezzanine,theclanks/mezzanine,gradel/mezzanine,tuxinhang1989/mezzanine,adrian-the-git/mezzanine,promil23/mezzanine,damnfine/mezzanine