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 in debug-mode and also allows for stepping-through of the code in Nodeclipse (Keplar). 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.

![screen shot 2014-02-19 at 4 08 01 pm](https://f.cloud.github.com/assets/6683904/2212405/5e176828-99b2-11e3-8dd3-fa69233f074b.png)