Bugfix setting author of blog post in BlogPostAdmin to be compatible with DisplayableAdmin.
Bugfix setting author of blog post in BlogPostAdmin to be compatible with DisplayableAdmin.

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