Add .travis.yml for Travis CI (http://travis-ci.org/)

.travis.yml

+language: python
+
+python:
+  - 2.5
+  - 2.6
+  - 2.7
+  # - 3.2
+
+install: pip install .
+
+script: CFLAGS=-O0 python runtests.py -vv

tox.ini

@@ -9,4 +9,4 @@ envlist = py25, py26, py27, py30, py31, py32, pypy
 [testenv]
 setenv = CFLAGS=-O0
 commands =
-    {envpython} runtests.py -vv --cython-only
+    {envpython} runtests.py -vv