Run from anywhere

### As a developer, I want a command-line interface for starting the VWF server for my app

**Acceptance Criteria**

Start the vwf server by simply running:

    $ vwf

Your application is now up and running at http://localhost:3000.

**Done**

- Allows you to run VWF from outside of the VWF repo.
- Adds a script for running VWF from command line.
  - Copy the script to your /usr/local/bin to add the ability to start VWF from anywhere.

Refs #2963 - [Redmine link](http://redmine.virtualworldframework.com/issues/2963)