Log Message:
update to 1.8.3

1.8.3 (svn revision 146):
 * fixed bug in Geod class that caused erroneous error message
   "undefined inverse geodesic (may be an antipodal point)".
 * fix __reduce__ method of Geod class so instances can be pickled.
 * make sure points outside projection limb are set to 1.e30 on inverse
   transform (if errcheck=False).
 * fixed small setup.py bug.
 * generate C source with Cython 0.9.6.6 (pycompat.h no longer needed).