Don't test for stack traces in Safari 5

spec/core/ExceptionFormatterSpec.js

@@ -41,7 +41,7 @@ describe("ExceptionFormatter", function() {
 
   describe("#stack", function() {
     it("formats stack traces from Webkit, Firefox, node.js or IE10+", function() {
-      if (jasmine.getEnv().ieVersion < 10) { return; }
+      if (jasmine.getEnv().ieVersion < 10 || jasmine.getEnv().safariVersion < 6) { return; }
 
       var error;
       try { throw new Error("an error") } catch(e) { error = e; }

spec/helpers/BrowserFlags.js

@@ -7,4 +7,13 @@
 
     return match ? parseFloat(match[1]) : Number.MAX_VALUE;
   })();
+
+  env.safariVersion = (function() {
+    var userAgent = jasmine.getGlobal().navigator.userAgent;
+    if (!userAgent) { return Number.MAX_VALUE; }
+
+    var match = /Safari/.exec(userAgent) && /Version\/([0-9]{0,})/.exec(userAgent);
+
+    return match ? parseFloat(match[1]) : Number.MAX_VALUE;
+  })();
 })(jasmine.getEnv());