Compress and gzip static assets

[jpillora]

On a slow connection, it's very difficult to download the 1.6MB JS file

-rw-r--r--  1 jpillora  staff   1.6M 31 May 03:19 application.js
-rw-r--r--  1 jpillora  staff   609K 31 May 03:21 application.min.js
-rw-r--r--  1 jpillora  staff   192K 31 May 03:21 application.min.js.gz