base URL not respected <base href="..." />

[internationils]

WWW::Mechanize does not respect <base href="...">
See https://gist.github.com/motemen/846251 for details
This applies to ->base and ->url_abs (at least)

[haarg]

This looks like the same issue as libwww-perl/libwww-perl#216. WWW::Mechanize only makes a difference because it adds a "Accept-Encoding: gzip" header by default. The handling for <base> doesn't understand the encoded content.