Silence which output to STDOUT

[ArnisL]

Unsure how good/bad idea this is

But at least locally I've made these changes:

      def system_phantomjs_path
        #`which phantomjs`.delete("\n")
        (system 'which phantomjs', STDOUT: '/dev/null').delete("\n")
      rescue
      end

Maybe others find this a good idea

[mokoaki]

+1

[tuxayo]

See #85 for a pull request that would close this.