Create WOFF files with Zopfli compression

 This is a modified version of the sfnt2woff utility that uses Zopfli
 as a compression algorithm instead of zlib. This results in compression
 gains of, on average, 5-8% compared to regular WOFF files. Zopfli
 generates compressed output that is compatible with regular zlib
 compression so the resulting WOFF files can be used everywhere.
 .
 This package provides two tools:
  * sfnt2woff-zopfli: convert OpenType fonts to WOFF
  * woff2sfnt-zopfli: convert WOFF fonts to OpenType