Minifier with detailed size stats.

Example output:

$ make min
            raw     min    gzip
-------------------------------
html:      .4kB    .4kB    .2kB
js:      64.2kB  38.1kB   9.1kB
css:      8.3kB   2.6kB   1.1kB
===============================
         72.9kB  41.1kB  10.4kB