Getter function of templates for each applications.

    Argument `name` will be interpreted as colon separated, the left value
    means application name, right value means a template name.

        get_app_template('blog:dashboarb.mako')

    It will return a template for dashboard page of `blog` application.

def get_app_template(name):
    """ Getter function of templates for each applications.

    Argument `name` will be interpreted as colon separated, the left value
    means application name, right value means a template name.

        get_app_template('blog:dashboarb.mako')

    It will return a template for dashboard page of `blog` application.
    """
    app_name, template_name = name.split(':')
    return get_lookups()[app_name].get_template(template_name)