Also test Python 2.6, 3.3, 3.5

.travis.yml

@@ -3,8 +3,11 @@ sudo: false
 language: python
 
 python:
+- '2.6'
 - '2.7'
+- '3.3'
 - '3.4'
+- '3.5'
 
 env:
   global:
@@ -55,3 +58,10 @@ deploy:
   on:
     repo: tweepy/tweepy
     branch: release
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - python: '2.6'
+    - python: '3.3'
+    - python: '3.5'