Add support for checking arguments with proc

[paneq]

RSpec lets you do this:

library.should_receive(:checkout).with{|c| c.bytesize == 9 }.and_return(:checked_out)

Would be cool to have it supported in bogus:

describe Library do
  it "does something" do
    library = Library.new
    stub(library).checkout(with{|c| c.bytesize == 9 }) { :checked_out }
    library.checkout("some book").should == :checked_out
  end
end

[wrozka]

Good idea, I like the with api, we'll implement something like this soon.

[paneq]

@wrozka Good to hear it :)

[paneq]

Ship it ! :+1:

[psyho]

Shipped :)