TODO
- default manifest to clone over any folders + files + apply erb to any *.erb
files
- rspec examples generated for application_generator and component_generator
as per newgem
- Labels for displays based on scope (common, rails, newgem), not rubygems,
builtin, etc. Perhaps use one PathSource per scope. See
RubiGen::Scripts::Base#usage_message
- Local generators (~/.rubigen) can be scoped (~/.rubigen/rails_generators)