Compress static resources using zopfli instead of gzip

[François Marier]

Google just released a new deflate compressor which is backwards-compatible with all existing clients, but achieves slightly better compression at the expense of extremely slow compression:

  http://googledevelopers.blogspot.com.au/2013/02/compress-data-more-densely-with-zopfli.html

Given that we pre-compress all of our resources already, we should switch to that new algorithm.

The pigz package in Debian experimental supports th zopfli algorithm as of version 2.3:

  http://mail.zlib.net/pipermail/pigz-announce_zlib.net/2013-March/000007.html

[François Marier (fmarier)]

The compressor is now available in Debian: https://packages.debian.org/jessie/zopfli