Enabled gzip compression!

changed gzip:'true’… According to the node-static read me this
shouldn’t work, but it works to compress all files.

/audio/alarm.mp3 drops from 587,716 bytes to 4,822!

TEST OUTPUT
macbookpro:audio dev$ curl http://localhost:1337/audio/alarm.mp3
--silent --write-out "%{size_download}\n" --output /dev/null
587716

curl --compress http://localhost:1337/audio/alarm.mp3 --silent
--write-out "%{size_download}\n" --output /dev/null
4822