Merge branch 'ie11-maps-support' of https://github.com/Volox/jasmine into Volox-ie11-maps-support

- Merges #1477 from @Volox
- Fixes #1472

spec/helpers/checkForMap.js

@@ -3,10 +3,25 @@
     if (typeof Map === 'undefined') { return false; }
 
     try {
-      var s = new Map([['a', 4]]);
-      if (s.size !== 1) { return false; }
-      if (s.keys().next().value !== 'a') { return false; }
-      if (s.values().next().value !== 4) { return false; }
+      var s = new Map();
+      s.set('a',1);
+      s.set('b',2);
+
+      if (s.size !== 2) { return false; }
+      if (s.has('a') !== true) { return false; }
+
+      var iterations = 0;
+      var ifForEachWorking = true;
+      s.forEach(function(value, key, map) {
+        ifForEachWorking = ifForEachWorking && map === s;
+        if (key==='a') {
+          ifForEachWorking = ifForEachWorking && value===1;
+        }
+        iterations++;
+      });
+      if (iterations !== 2) { return false; }
+      if (ifForEachWorking !== true) { return false; }
+
       return true;
     } catch(e) {
       return false;