Remove python 3.2 from travis tests

Travis is using an old version of python 3.2 that doesn't support the u
character in front of strings. It's not worth fixing for just that, and
python 3.3 gives enough coverage for python3.

.travis.yml

@@ -3,7 +3,6 @@ language: python
 python:
   - 2.6
   - 2.7
-  - 3.2
   - 3.3
   - pypy