Update blog_recent_posts to allow an optional slug
Update blog_recent_posts to allow an optional slug

If the slug is specified returned blog posts will be restricted to being in the category matching the slug.  If the slug does not match a category, posts will be returned as normal.
biomassives/mezzanine,agepoly/mezzanine,stephenmcd/mezzanine,cccs-web/mezzanine,molokov/mezzanine,webounty/mezzanine,wrwrwr/mezzanine,gbosh/mezzanine,adrian-the-git/mezzanine,industrydive/mezzanine,stephenmcd/mezzanine,ZeroXn/mezzanine,dsanders11/mezzanine,fusionbox/mezzanine,emile2016/mezzanine,saintbird/mezzanine,promil23/mezzanine,dustinrb/mezzanine,biomassives/mezzanine,webounty/mezzanine,AlexHill/mezzanine,frankier/mezzanine,christianwgd/mezzanine,Skytorn86/mezzanine,damnfine/mezzanine,fusionbox/mezzanine,biomassives/mezzanine,webounty/mezzanine,sjdines/mezzanine,mush42/mezzanine,Cicero-Zhao/mezzanine,joshcartme/mezzanine,agepoly/mezzanine,ZeroXn/mezzanine,dekomote/mezzanine-modeltranslation-backport,agepoly/mezzanine,sjuxax/mezzanine,dovydas/mezzanine,dsanders11/mezzanine,mush42/mezzanine,promil23/mezzanine,dekomote/mezzanine-modeltranslation-backport,Skytorn86/mezzanine,readevalprint/mezzanine,Kniyl/mezzanine,orlenko/sfpirg,jjz/mezzanine,spookylukey/mezzanine,SoLoHiC/mezzanine,batpad/mezzanine,orlenko/plei,vladir/mezzanine,viaregio/mezzanine,ryneeverett/mezzanine,wyzex/mezzanine,jerivas/mezzanine,sjuxax/mezzanine,douglaskastle/mezzanine,eino-makitalo/mezzanine,Cicero-Zhao/mezzanine,dovydas/mezzanine,dustinrb/mezzanine,stbarnabas/mezzanine,gradel/mezzanine,saintbird/mezzanine,AlexHill/mezzanine,douglaskastle/mezzanine,frankier/mezzanine,tuxinhang1989/mezzanine,wyzex/mezzanine,stbarnabas/mezzanine,vladir/mezzanine,gbosh/mezzanine,scarcry/snm-mezzanine,viaregio/mezzanine,geodesign/mezzanine,scarcry/snm-mezzanine,stephenmcd/mezzanine,industrydive/mezzanine,gradel/mezzanine,dovydas/mezzanine,jjz/mezzanine,nikolas/mezzanine,Cajoline/mezzanine,frankchin/mezzanine,Cajoline/mezzanine,jjz/mezzanine,geodesign/mezzanine,tuxinhang1989/mezzanine,dsanders11/mezzanine,spookylukey/mezzanine,adrian-the-git/mezzanine,nikolas/mezzanine,gbosh/mezzanine,geodesign/mezzanine,ryneeverett/mezzanine,wbtuomela/mezzanine,ryneeverett/mezzanine,molokov/mezzanine,cccs-web/mezzanine,promil23/mezzanine,christianwgd/mezzanine,wyzex/mezzanine,Kniyl/mezzanine,frankchin/mezzanine,joshcartme/mezzanine,nikolas/mezzanine,orlenko/sfpirg,sjdines/mezzanine,spookylukey/mezzanine,vladir/mezzanine,dekomote/mezzanine-modeltranslation-backport,damnfine/mezzanine,adrian-the-git/mezzanine,frankier/mezzanine,emile2016/mezzanine,sjdines/mezzanine,joshcartme/mezzanine,theclanks/mezzanine,viaregio/mezzanine,jerivas/mezzanine,jerivas/mezzanine,eino-makitalo/mezzanine,PegasusWang/mezzanine,SoLoHiC/mezzanine,eino-makitalo/mezzanine,frankchin/mezzanine,saintbird/mezzanine,dustinrb/mezzanine,wrwrwr/mezzanine,molokov/mezzanine,orlenko/plei,christianwgd/mezzanine,Skytorn86/mezzanine,Kniyl/mezzanine,gradel/mezzanine,mush42/mezzanine,douglaskastle/mezzanine,batpad/mezzanine,readevalprint/mezzanine,damnfine/mezzanine,theclanks/mezzanine,scarcry/snm-mezzanine,sjuxax/mezzanine,emile2016/mezzanine,orlenko/plei,readevalprint/mezzanine,industrydive/mezzanine,ZeroXn/mezzanine,Cajoline/mezzanine,PegasusWang/mezzanine,orlenko/sfpirg,PegasusWang/mezzanine,wbtuomela/mezzanine,SoLoHiC/mezzanine,wbtuomela/mezzanine,tuxinhang1989/mezzanine,theclanks/mezzanine