CT-672 Update Nokogiri gem security
CT-672 Update Nokogiri gem security

Advisory: CVE-2016-4658

URL: https://github.com/sparklemotion/nokogiri/issues/1615

Solution: upgrade to >= 1.7.1

ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff