Minor fixes of last version

- Added `clear color` to labels background
- Moved the `actionBlock` from the method `touchesBegan` to `touchesEnded`. Is more logical and its how buttons work, don't trigger the action until the touch has ended.
- Changed the line `self.textLabel = @""` for `self.iconLabel = @""`. In this case we are working over the iconLabel not the textLabel.