'Move a version within a project\'s ordered version list and return a new version Resource for it.
One, but not both, of ``after`` and ``position`` must be specified.
:param id: ID of the version to move
:param after: the self attribute of a version to place the specified version after (that is, higher in the list)
:param position: the absolute position to move this version to: must be one of ``First``, ``Last``,
``Earlier``, or ``Later``'

def move_version(self, id, after=None, position=None):

    data = {}
    if (after is not None):
        data[u'after'] = after
    elif (position is not None):
        data[u'position'] = position
    url = self._get_url(((u'version/' + id) + u'/move'))
    r = self._session.post(url, data=json.dumps(data))
    version = Version(self._options, self._session, raw=json_loads(r))
    return version
