Update nokogiki dependency >= 1.5
Update nokogiki dependency >= 1.5

Following http://guides.rubygems.org/patterns/

A previous update forcing only Nokogiri 1.6 breaks several
applications.  Since Nokogiri 1.5 still works just fine I
modified the dependency to be >= 1.6 which accounts for
Nokogiri 1.6 as well.

1dtouch/omniauth-cas,identification-io/omniauth-cas,dlindahl/omniauth-cas,CruGlobal/omniauth-cas,txstate-etc/omniauth-cas,LabSEC/omniauth-cas,tduehr/omniauth-cas3,ikbear/omniauth-cas