nancy built in

This gives the option to choose Nancy as an option.

I did this quite quickly but couldn't see how how to create parent-child type options as I mentioned here - https://github.com/ligershark/Kulture/issues/7 with all frameowrk options under Console, Web parents.  This is why Nancy appears as a top level item with the others.  It also adds some `if` statements in which going forward is not very elegant if other frameworks want to add their templates as it will turn into one big `if` statement so ideally we may need to refactor the generator after this PR.  As I say this was quickly done in time for the blog post. :smile: