Fix problem with travis not using correct python versions when testing.

.travis.yml

@@ -1,10 +1,11 @@
 language: python
-env:
+python:
-  - TOX_ENV=py26
+  - "2.6"
-  - TOX_ENV=py27
+  - "2.7"
-  - TOX_ENV=py33
+  - "3.3"
-  - TOX_ENV=py34
+  - "3.4"
 
-install: pip install tox
+install: 
+  - pip install . pytest mock
 
-script: tox -e $TOX_ENV
+script: py.test

tests/pytest.ini

@@ -0,0 +1,2 @@
+[pytest]
+addopts=--capture=sys --showlocals

tox.ini

@@ -3,4 +3,4 @@ envlist = py26, py27, py33, py34
 [testenv]
 deps = pytest
     mock
-commands = py.test --capture=sys --showlocals
+commands = py.test