[cambriar]

Thanks a lot for open sourcing Color Picker Pro, I think it's an awesome utility.

As for the calculator, it nice to see a different approach to a simple problem. There is, however, a line of code missing from the :buttonPressed function. For the case of kButtonSubtract, it needs to set deleteInput to YES.

Thanks for the awesome Cocoa contributions. Please, keep it up.

[oscardelben]

pull request merged, I missed that in a refactoring! Should probably add tests in the next product.