Simplify .travis.yml

.travis.yml

@@ -1,16 +1,10 @@
 language: python
-python:
+env:
-    - 2.5
+    - TOXENV=py25 PIP_INSECURE=t
-    - 2.6
+    - TOXENV=py26
-    - 2.7
+    - TOXENV=py27
-    - 3.2
+    - TOXENV=py32
 install:
-    - if [[ $TRAVIS_PYTHON_VERSION == '2.5' ]]; then
-      export PIP_INSECURE=t;
-      fi
     - pip install --use-mirrors tox
 script:
-    - export TOXENV=$(echo "$TRAVIS_PYTHON_VERSION" |
-                      sed --regexp-extended 's/([0-9])\.([0-9])/py\1\2/g')
-    - echo "TOXENV=$TOXENV"
     - tox