Make gist.rb executable
Make gist.rb executable

Signed-off-by: R. Tyler Ballance <ae42760ef71e07cdc78c21849b44551816bda917@slide.com>

Jwata/gist-old,dLobatog/gist,ConradIrwin/gist,mofodox/gist,zmwangx/gist,ConradIrwin/jist,roxyboy/jist,roxyboy/gist,retrography/gist,ryanbradynd05/gist,mattn/gist,bchase/gist,ConradIrwin/gist,flores/gist,defunkt/gist,eLobato/gist