.travis.yml: Add 3.2 and 3.3

.travis.yml

@@ -6,6 +6,8 @@ python:
   - "2.5"
   - "2.6"
   - "2.7"
+  - "3.2"
+  - "3.3"
 # command to install dependencies
 install:
   - pip install -r test_requirements.txt --use-mirrors