Auto documentation for nodes

[graysonhead]

We need to come up with a way of automatically documenting what node types are valid, and which functions are associated with them. The dispatch trees that could be used to generate this are located in the following methods:

Appliance._build_dispatch_tree()
Appliance.interface_dispatch()

Ideally we would want to render the information contained within those dicts in an auto-module like fashion on the configuration docs page.