Make render_errors runtime config
Make render_errors runtime config

eksperimental/phoenix,0x00evil/phoenix,rafbgarcia/phoenix,jwarwick/phoenix,michalmuskala/phoenix,optikfluffel/phoenix,0x00evil/phoenix,michalmuskala/phoenix,optikfluffel/phoenix,phoenixframework/phoenix,eksperimental/phoenix,nshafer/phoenix,keathley/phoenix,rafbgarcia/phoenix,nshafer/phoenix,phoenixframework/phoenix,rafbgarcia/phoenix,phoenixframework/phoenix,optikfluffel/phoenix,nshafer/phoenix,0x00evil/phoenix,jwarwick/phoenix,keathley/phoenix