***************************************************************************
@method _initializeParameters
@description Initializes all parameters. If a parameter is not an instance
of {@link carbond.OperationParameter}, it will be instantiated
as such.
@returns {undefined}
function() {
    let parameters = this.parameters
    for (let parameterName in parameters) {
      let parameter = parameters[parameterName]
      if (!(parameter instanceof OperationParameter)) {
        parameter = o(_.assign({name: parameterName}, parameter),
                      OperationParameter)
        parameters[parameterName] = parameter // set it back
      }
    }
  }