Add Vagrant

[knpwrs]

This adds a Vagrant box which runs the demo on Nginx. If this sounds like a good idea I can go ahead and configure additional boxes for Apache and Standalone.

[FooBarWidget]

Yes this is a good idea. A few comments though:

• I think Vagrant-specific resource files, like the Nginx config file, should be placed in a directory named dev or vagrant in order to signal that they're only supposed to be used during development, not production.
• The provisioning shell script should be stored in an external file so that syntax highlighting works properly.
• The provisioning shell script should be idempotent. It looks like a reprovision would fail on the ln calls.

[knpwrs]

Cool, I'll take a look at those things when I get home today.