Have QueueRunner run specs iteratively if possible, fallback to recursion for async specs

This prevents the stack from growing as large for the normal cases and is giving a significant speedup for the performance suite

src/core/Suite.js

@@ -93,9 +93,7 @@ getJasmineRequireObj().Suite = function() {
     }
 
     function wrapChild(child) {
-      return function(done) {
-        child.execute(done);
-      };
+      return function() { child.execute(); };
     }
   };