Profiling example app

WIP
Sam, the goal is to generate good graphs and show the heap count increase. The first post request burns CPU. The second post request, calls this https://github.com/strongloop/profiler-demo-app/blob/feature/initial/common/models/document.js which increases the object count. As per my understanding that is an example of leaking objects, right?
I'll remove the other get request. That just added some extra load. I'll update the Readme with what it does.