Check the version of Bower to ensure this module will work. Currently
    bower must be at least version 1.3.

def _check_valid_version():
    '''
    Check the version of Bower to ensure this module will work. Currently
    bower must be at least version 1.3.
    '''
    # pylint: disable=no-member
    bower_version = _LooseVersion(
        __salt__['cmd.run']('bower --version'))
    valid_version = _LooseVersion('1.3')
    # pylint: enable=no-member
    if bower_version < valid_version:
        raise CommandExecutionError(
            '\'bower\' is not recent enough({0} < {1}). '
            'Please Upgrade.'.format(
                bower_version, valid_version
            )
        )