Fix adding map to list in addcyclic

[xylar]

This corrects an earlier fix to support python 2 and 3

closes #440

[xylar]

With this fix, the follow test (same as in #440) works correctly for me:

#!/usr/bin/env python

from mpl_toolkits.basemap import addcyclic
import numpy

lon = numpy.arange(0., 360., 0.5)
lat = numpy.arange(-90., 90.5, 0.5)

Lon, Lat = numpy.meshgrid(lon, lat)

field = numpy.sin(numpy.deg2rad(Lat))

fieldCyc, latCyc, lonCyc = addcyclic(field, Lat, Lon)

[WeatherGod]

Looks like I'll have to put out a v1.2.1 release soonish.

[xylar]

Thanks, @WeatherGod