module Rails::Command::Behavior

def namespaces_to_paths(namespaces)

in both: "rails/model/model_generator" and "rails/model_generator".
an extra lookup. For example, "rails:model" should be searched
Convert namespaces to paths by replacing ":" for "/" and adding 
def namespaces_to_paths(namespaces)
  paths = []
  namespaces.each do |namespace|
    pieces = namespace.split(":")
    path = pieces.join("/")
    paths << "#{path}/#{pieces.last}"
    paths << path
  end
  paths.uniq!
  paths
end