code: def mech(&block)
      m = Mechanize.new do |m|
        m.cert_store = OpenSSL::X509::Store.new
        m.cert_store.add_file mitca_path
        m.user_agent_alias = 'Linux Firefox'
        yield m if block
        m
      end
      m
    end
docs: Client for accessing public information.
  
   Call auth to authenticate as a user and access restricted functionality.
   New Mechanize instance.