code: function(connection, collection, criteria, field, amount, cb) {
        return connections[connection].increment(collection, criteria, field, amount, cb);
      }
docs: Increment
  
  Increments a field by a given amount
  
  @param {Object} connection
  @param {Object} collection
  @param {Object} criteria
  @param {String} field
  @param {Number} amount
  @param {Function} cb