Describes the format of a pagespeed configuration from a yaml file.
URL blacklist entries are patterns (with '?' and '*' as wildcards). Any URLs
that match a pattern on the blacklist will not be optimized by PageSpeed.
Rewriter names are strings (like 'CombineCss' or 'RemoveComments') describing
individual PageSpeed rewriters. A full list of valid rewriter names can be
found in the PageSpeed documentation.
The domains-to-rewrite list is a whitelist of domain name patterns with '*' as
a wildcard, optionally starting with 'http://' or 'https://'. If no protocol
is given, 'http://' is assumed. A resource will only be rewritten if it is on
the same domain as the HTML that references it, or if its domain is on the
domains-to-rewrite list.