code: function CallbackHandler(callable) {
      CallbackHandler.super_.call(this);
  
      if (!_.isFunction(callable)) {
          throw new TypeError(
              'Argument  must be valid callable'
          );
      }
  
      this.__callable = callable;
  }
docs: Wrapper for Closures passed as handlers. Can be used
  directly, or will be instantiated automagically by Ouch
  if passed to ouchInstance.pushHandler
  
  @param {function} callable
  @constructor
  @throws TypeError if argument is not callable