Made the "clustering" of workers configurable.

Hello, I made the spawning of a cluster of workers configurable from the config file as clustering is not always necessary for local development. Being able to turn off  "clustering" allows for the eCrud project to be ran within Nodeclipse (Keplar) in debug-mode and also allows for stepping-through of the code. The eCrud project will not run in debug-mode within Nodeclipse when clustering is turned on. Being able to step-through code and also being able to setup breakpoints within code is vital for most developers.

In the picture below, clustering is turned off via a config property, allowing the eCrud project to be run in debug mode within Nodeclipse.

![screen shot 2014-02-19 at 4 08 01 pm](https://f.cloud.github.com/assets/6683904/2212405/5e176828-99b2-11e3-8dd3-fa69233f074b.png)