add a warning about template names needing a file extension in current master
add a warning about template names needing a file extension in current master

gjaldon/phoenix,Joe-noh/phoenix,trarbr/phoenix,dmarkow/phoenix,eksperimental/phoenix,keathley/phoenix,michalmuskala/phoenix,optikfluffel/phoenix,Kosmas/phoenix,mitchellhenke/phoenix,mobileoverlord/phoenix,CultivateHQ/phoenix_guides,nshafer/phoenix,Gazler/phoenix,ugisozols/phoenix_guides,phoenixframework/phoenix,0x00evil/phoenix,jeffkreeftmeijer/phoenix_guides,michalmuskala/phoenix,mydearxym/phoenix_guides,mitchellhenke/phoenix,bratsche/phoenix_guides,rafbgarcia/phoenix,bsmr-erlang/phoenix,tokafish/phoenix_guides,greyhwndz/phoenix_guides,jwarwick/phoenix,rafbgarcia/phoenix,Kosmas/phoenix,evax/phoenix,stevedomin/phoenix,0x00evil/phoenix,Joe-noh/phoenix,gjaldon/phoenix,dmarkow/phoenix,pap/phoenix-guides,optikfluffel/phoenix,keathley/phoenix,clessg/phoenix_guides,phoenixframework/phoenix,trarbr/phoenix,wsmoak/phoenix_guides,korobkov/phoenix,fblecha/phoenix_guides,evax/phoenix,3quarterstack/phoenix_guides,bsmr-erlang/phoenix,korobkov/phoenix,0x00evil/phoenix,rafbgarcia/phoenix,optikfluffel/phoenix,oldfartdeveloper/phoenix_guides,phoenixframework-Brazil/phoenix_guides,stevedomin/phoenix_guides,Gazler/phoenix,nshafer/phoenix,thetamind/phoenix_guides,tianyi33/phoenix_guides,sakishum/phoenix_guides,tuvistavie/phoenix_guides,mschae/phoenix,mschae/phoenix,iguberman/phoenix_guides,leikind/phoenix_guides,phoenixframework/phoenix,jwarwick/phoenix,1ternal/phoenix_guides,philss/phoenix_guides,mobileoverlord/phoenix,nshafer/phoenix,stevedomin/phoenix,pap/phoenix,pap/phoenix,larrylv/phoenix_guides,eksperimental/phoenix