'Iterate over email addresses for the authenticated user.
:param int number: (optional), number of email addresses to return.
Default: -1 returns all available email addresses
:param str etag: (optional), ETag from a previous request to the same
endpoint
:returns: generator of dicts'

@requires_auth
def emails(self, number=(-1), etag=None):

    url = self._build_url(u'user', u'emails')
    return self._iter(int(number), url, users.Email, etag=etag)
