Drop 2.6 and 3.2 from Travis tests

.travis.yml

@@ -1,13 +1,10 b''
 # http://travis-ci.org/#!/ipython/ipython
 language: python
 python:
-    - 2.6
     - 2.7
-    - 3.2
     - 3.3
 before_install:
-    - "if [[ $TRAVIS_PYTHON_VERSION == '3.2'* ]]; then pip install -Iv https://pypi.python.org/packages/source/J/Jinja2/Jinja2-2.6.tar.gz; fi"
-    - "if [[ ! $TRAVIS_PYTHON_VERSION == '3.2'* ]]; then pip install jinja2; fi"
+    - pip install jinja2
     - easy_install -q pyzmq
     - sudo apt-get install pandoc
     - pip install pygments