config.define_implicit_subject feature

Created by: dnurzynski

Hi, In each project I see something like this in all model specs:

describe ExampleModel do
  subject { Factory :example_model }
  ...
end

What do you think about one method in configuration to change default behaviour for implicit subject ?

config.define_implicit_subject :model => true do |described|
  Factory described.to_s.underscore
end

I know it's maybe one line for file but it would be more flexible ( especialy switching from FactoryGirl to Mechanist or something like that )

PS: if you like the idea I'll add some coments and cukes for it...