fix(element): fix an error where all.then() wasn't calling callbacks.

Closes #267

Author: juliemr

lib/protractor.js

@@ -109,8 +109,8 @@ var buildElementHelper = function(ptor) {
       return new webdriver.WebElement(ptor.driver, id);
     };
 
-    elementArrayFinder.then = function() {
-      return ptor.findElements(locator);
+    elementArrayFinder.then = function(fn) {
+      return ptor.findElements(locator).then(fn);
     };
 
     return elementArrayFinder;