Add .travis.yml.
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..32d2824
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,10 @@
+language: python
+python: 2.7
+env:
+  - TOXENV=py27
+install:
+  - pip install tox
+script:
+  - tox -v
+  - tox -v -e style
+