If the Mackup home folder does not exist, create it.

def create_mackup_home(self):
        """If the Mackup home folder does not exist, create it."""
        if not os.path.isdir(self.mackup_folder):
            if utils.confirm("Mackup needs a directory to store your"
                             " configuration files\n"
                             "Do you want to create it now? <{}>"
                             .format(self.mackup_folder)):
                os.makedirs(self.mackup_folder)
            else:
                utils.error("Mackup can't do anything without a home =(")