[chef] Cookbook dependency graphing

["steve ." < >]

Not sure if anyone's already doing something like this, but I made some REALLY MINOR modifications to the most ancient and venerable Ruby depgraph tool and got it parsing cookbook metadata instead of C# code and installed gems.

http://github.com/leftathome/depgraph

Default behavior is to parse, fire up graphviz and show you a dependency graph.  That's fine but I wanted it as a JSON object.

I added the -json switch to allow you to generate an object that looks like this:

{ "cookbook" : [ "dependency1", "dependency2"],

 ...

}

Hope someone out there finds this useful.