Fix failing specs under JRuby due to HTML examples (closes #74).
Fix failing specs under JRuby due to HTML examples (closes #74).

* Under JRuby nokogiri uses the NekoHTML parser, which is stricter than libxml2, thus
  will (re)nest elements differently.
  https://github.com/sparklemotion/nokogiri/issues/2141#issuecomment-749536054

postmodern/spidr