Added Rspec::Generators::GeneratorGenerator

[yhirano55]

My first contribution for rspec-rails.

When we execute bin/rails g generator awesome, rspec-rails does not generate a spec file.
So I've implemented new generator for generator :)

Please let me know if you have advice or questions. Thanks a lot!

[fables-tales]

hi @yhirano55 can you explain your use case for this a little more. The code looks fine but I'm just trying to understand what this might be used for in a practical rails app.

[yhirano55]

@samphippen Thank for the comment. On the test_unit, this boiler template file exist for generator generator. But on RSpec, it doen't have template same as this. Actually, we need to be helped by gem like this to write specs. But first of all, I've tried to make it generate the boiler template for generator generator.

[benoittgt]

Closing because we now have #2217