Render the blueprint into a temp directory using the context.

def render(self):
        """Render the blueprint into a temp directory using the context."""
        context = self.context
        if 'app' not in context:
            context['app'] = self.application.name
        temp_dir = self.temp_dir
        templates_root = self.blueprint.templates_directory
        for root, dirs, files in os.walk(templates_root):
            for directory in dirs:
                directory = os.path.join(root, directory)
                directory = render_from_string(directory, context)
                directory = directory.replace(templates_root, temp_dir, 1)
                os.mkdir(directory)
            for file in files:
                full_file = os.path.join(root, file)
                stat = os.stat(full_file)
                content = render_from_file(full_file, context)
                full_file = strip_extension(
                    render_from_string(full_file, context))
                full_file = full_file.replace(templates_root, temp_dir, 1)
                with open(full_file, 'w') as f:
                    f.write(content)
                os.chmod(full_file, stat.st_mode)