modified allowed file formats
modified allowed file formats

improves on the fix for #105
ryanmaclean/Gist,ecode/Gist,NetoBuenrostro/Gist,condemil/Gist,ecode/Gist,ryanmaclean/Gist,Ideabin/Gist,NetoBuenrostro/Gist,Ideabin/Gist