def rjs_check(path = @options[:rjs])
      rjs_command = rjs_file(path) || rjs_bin(path)
      if !(rjs_command)
        raise RuntimeError, "Could not find r.js optimizer in #{path.inspect} - try updating this by npm install -g requirejs"
      end
      rjs_command
    end
def rjs_check(path = @options[:rjs])
      rjs_command = rjs_file(path) || rjs_bin(path)
      if !(rjs_command)
        raise RuntimeError, "Could not find r.js optimizer in #{path.inspect} - try updating this by npm install -g requirejs"
      end
      rjs_command
    end
Incase both a file and bin version are availble file version is taken

 @return rjs_command to invoke r.js optimizer with