Add documentation about using AppConfigs in INSTALLED_APPS and defaults.py
Add documentation about using AppConfigs in INSTALLED_APPS and defaults.py

gradel/mezzanine,saintbird/mezzanine,molokov/mezzanine,Cicero-Zhao/mezzanine,eino-makitalo/mezzanine,ZeroXn/mezzanine,viaregio/mezzanine,geodesign/mezzanine,stephenmcd/mezzanine,webounty/mezzanine,douglaskastle/mezzanine,theclanks/mezzanine,readevalprint/mezzanine,spookylukey/mezzanine,vladir/mezzanine,ZeroXn/mezzanine,industrydive/mezzanine,mush42/mezzanine,christianwgd/mezzanine,viaregio/mezzanine,christianwgd/mezzanine,webounty/mezzanine,ryneeverett/mezzanine,saintbird/mezzanine,SoLoHiC/mezzanine,adrian-the-git/mezzanine,industrydive/mezzanine,viaregio/mezzanine,theclanks/mezzanine,ZeroXn/mezzanine,PegasusWang/mezzanine,jjz/mezzanine,damnfine/mezzanine,jerivas/mezzanine,dovydas/mezzanine,sjuxax/mezzanine,wyzex/mezzanine,frankchin/mezzanine,frankchin/mezzanine,christianwgd/mezzanine,Cajoline/mezzanine,adrian-the-git/mezzanine,joshcartme/mezzanine,molokov/mezzanine,dustinrb/mezzanine,promil23/mezzanine,jerivas/mezzanine,dsanders11/mezzanine,PegasusWang/mezzanine,eino-makitalo/mezzanine,Cicero-Zhao/mezzanine,Kniyl/mezzanine,wyzex/mezzanine,vladir/mezzanine,douglaskastle/mezzanine,mush42/mezzanine,ryneeverett/mezzanine,emile2016/mezzanine,geodesign/mezzanine,industrydive/mezzanine,biomassives/mezzanine,gradel/mezzanine,Kniyl/mezzanine,frankchin/mezzanine,promil23/mezzanine,Skytorn86/mezzanine,tuxinhang1989/mezzanine,saintbird/mezzanine,PegasusWang/mezzanine,SoLoHiC/mezzanine,emile2016/mezzanine,dustinrb/mezzanine,dsanders11/mezzanine,wbtuomela/mezzanine,frankier/mezzanine,damnfine/mezzanine,eino-makitalo/mezzanine,stephenmcd/mezzanine,jjz/mezzanine,dustinrb/mezzanine,SoLoHiC/mezzanine,geodesign/mezzanine,Cajoline/mezzanine,wyzex/mezzanine,frankier/mezzanine,Kniyl/mezzanine,promil23/mezzanine,nikolas/mezzanine,sjdines/mezzanine,stephenmcd/mezzanine,nikolas/mezzanine,joshcartme/mezzanine,mush42/mezzanine,dovydas/mezzanine,webounty/mezzanine,theclanks/mezzanine,sjdines/mezzanine,biomassives/mezzanine,Cajoline/mezzanine,nikolas/mezzanine,spookylukey/mezzanine,readevalprint/mezzanine,Skytorn86/mezzanine,emile2016/mezzanine,douglaskastle/mezzanine,Skytorn86/mezzanine,sjuxax/mezzanine,readevalprint/mezzanine,tuxinhang1989/mezzanine,gradel/mezzanine,joshcartme/mezzanine,adrian-the-git/mezzanine,dsanders11/mezzanine,sjuxax/mezzanine,wbtuomela/mezzanine,ryneeverett/mezzanine,damnfine/mezzanine,wbtuomela/mezzanine,tuxinhang1989/mezzanine,spookylukey/mezzanine,molokov/mezzanine,dovydas/mezzanine,vladir/mezzanine,jjz/mezzanine,biomassives/mezzanine,frankier/mezzanine,jerivas/mezzanine,sjdines/mezzanine