Added rel attribute to auto_link()
Added rel attribute to auto_link()

Fixed security issue:  allowing the target page to take control of the original page

Details about the issue here: https://mathiasbynens.github.io/rel-noopener/
ytetsuro/CodeIgniter,ytetsuro/CodeIgniter,madwings/InsaneDB,bcit-ci/CodeIgniter,jim-parry/CodeIgniter,ytetsuro/CodeIgniter,asmdigital/CodeIgniter,bcit-ci/CodeIgniter,tianhe1986/CodeIgniter,butane/CodeIgniter,kamaslau/BasicCodeIgniter,kamaslau/BasicCodeIgniter,tianhe1986/CodeIgniter,butane/CodeIgniter,bcit-ci/CodeIgniter,tianhe1986/CodeIgniter,bcit-ci/CodeIgniter,tianhe1986/CodeIgniter,bcit-ci/CodeIgniter,jim-parry/CodeIgniter,jim-parry/CodeIgniter,butane/CodeIgniter,asmdigital/CodeIgniter,asmdigital/CodeIgniter,jim-parry/CodeIgniter,madwings/InsaneDB,madwings/InsaneDB,asmdigital/CodeIgniter,kamaslau/BasicCodeIgniter,asmdigital/CodeIgniter,kamaslau/BasicCodeIgniter,ytetsuro/CodeIgniter,jim-parry/CodeIgniter,butane/CodeIgniter,madwings/InsaneDB,madwings/InsaneDB,butane/CodeIgniter,ytetsuro/CodeIgniter,tianhe1986/CodeIgniter