fix(cucumber): fix beforeFeature event handler call guard

Fixes the run failures reported in cucumber/cucumber-js#342.

lib/frameworks/cucumber.js

@@ -79,7 +79,7 @@ exports.run = function(runner, specs) {
     var originalHandleBeforeFeatureEvent = formatter.handleBeforeFeatureEvent;
     formatter.handleBeforeFeatureEvent = function(event, callback) {
       feature = event.getPayloadItem('feature');
-      if (typeof originalHandleAfterScenarioEvent == 'function') {
+      if (typeof originalHandleBeforeFeatureEvent == 'function') {
         originalHandleBeforeFeatureEvent.apply(formatter, arguments);
       } else {
         callback();