dist underscore event name fix

Author: andrewgouin

dist/lib/String.js

@@ -17,8 +17,8 @@
     value: true
   });
   var camelize = exports.camelize = function camelize(str) {
-    return str.split(' ').map(function (word) {
+    return str.split('_').map(function (word) {
       return word.charAt(0).toUpperCase() + word.slice(1);
     }).join('');
   };
-});
+});