chore(micro-perf): add perf tests for retry with queue scheduler

Results on a Intel Core i7-3770 (Ivy Bridge) running Ubuntu:

                  |      RxJS 4.0.7 | RxJS 5.0.0-beta.1 | factor | % improved
------------------------------------------------------------------------------
retry - immediate | 41,067 (±1.04%) |  179,337 (±1.10%) |  4.37x |     336.7%
            retry | 33,846 (±1.19%) |   97,202 (±0.62%) |  2.87x |     187.2%

perf/micro/current-thread-scheduler/operators/retry.js

@@ -0,0 +1,35 @@
+var RxOld = require('rx');
+var RxNew = require('../../../../index');
+
+module.exports = function (suite) {
+  var maxRetryCount = 25;
+  var oldRetryCount = 0;
+  var newRetryCount = 0;
+
+  var _old = RxOld.Observable.ofWithScheduler(RxOld.Scheduler.currentThread, 5)
+    .flatMap(function (x) {
+      if (++oldRetryCount < maxRetryCount - 1) {
+        return RxOld.Observable.throw(new Error('error'),  RxOld.Scheduler.currentThread);
+      }
+      return RxOld.Observable.ofWithScheduler(RxOld.Scheduler.currentThread, x);
+    }).retry(maxRetryCount);
+
+  var _new = RxNew.Observable.of(5, RxNew.Scheduler.queue)
+    .mergeMap(function (x) {
+      if (++newRetryCount < maxRetryCount - 1) {
+        return RxNew.Observable.throw(new Error('error'), RxNew.Scheduler.queue);
+      }
+      return RxNew.Observable.of(x, RxNew.Scheduler.queue);
+    }).retry(maxRetryCount);
+
+  function _next(x) { }
+  function _error(e) { }
+  function _complete() { }
+  return suite
+      .add('old retry with currentThread scheduler', function () {
+        _old.subscribe(_next, _error, _complete);
+      })
+      .add('new retry with currentThread scheduler', function () {
+        _new.subscribe(_next, _error, _complete);
+      });
+};