runner "is it crashing" timeout increase to 3 secs

This fixes the test failure of the 'run' from checkout.  (It would be
nice if we weren't slowing down the rebuild in 0.9.0, but at least we
should ensure that this feature survives.)

tools/run-app.js

@@ -633,8 +633,9 @@ _.extend(AppRunner.prototype, {
 
     while (true) {
       crashTimer = setTimeout(function () {
+        console.log("CRASH TIMER")
         crashCount = 0;
-      }, 2000);
+      }, 3000);
 
       var runResult = self._runOnce(function () {
         /* onListen */