code: function(callback) {
          var self = this;
  
          var requestOptions = {
              uri: '/volumes',
              endpoint: rackspace.Endpoints.CloudBlockStorage
          };
  
          self.authorizedRequest(requestOptions, function(err, res, body) {
              if (err || !body.volumes) {
                  callback(err ? err : body);
                  return;
              }
  
              var volumes = [];
  
              for (var i = 0; i < body.volumes.length; i++) {
                  volumes.push(new rackspace.Volume(self, body.volumes[i]));
              }
  
              callback(err, volumes);
          });
      }
docs: @name Client.getVolumes
  
  @description getVolumes retrieves your list of volumes
  
  @param {Function}            callback    handles the callback of your api call