create a 64MB swafile on travis

script/ci/before.sh

@@ -12,6 +12,12 @@ sh -e /etc/init.d/xvfb start
 #echo "Regenerating CSS files"
 #bundle exec sass -q --update public/stylesheets/sass/:public/stylesheets/
 
+# setup swapfile
+echo "creating a swapfile"
+sudo dd if=/dev/zero of=swapfile bs=1M count=64
+sudo mkswap swapfile
+sudo swapon swapfile
+
 # Create a database.yml for the right database
 echo "Setting up database.yml for $DB"
 cp config/database.yml.example config/database.yml