Log Message:
Update ruby-nokogiri to 1.6.7.1.

pkgsrc changes:
* Fix DEPENDS on required ${RUBY_PKGPREFIX}-mini_portile2>=2.0.0

Upstream changes:

=== 1.6.7.1 / 2015-12-16

This version pulls in several upstream patches to the vendored libxml2 and \ 
libxslt to address:

  CVE-2015-5312
  CVE-2015-7497
  CVE-2015-7498
  CVE-2015-7499
  CVE-2015-7500
  CVE-2015-8241
  CVE-2015-8242
  CVE-2015-8317

See also http://www.ubuntu.com/usn/usn-2834-1/