remove whiny versions of python and only test latest versions

Author: serkanyersen

.travis.yml

@@ -1,9 +1,7 @@
 language: python
 python:
-  - "2.6"
-  - "2.7"
-  - "3.2"
-  - "3.3"
+  - 2.7
+  - 3.3
 
 # command to run tests
 script: cd tests && python -m unittest discover