Testing on travis-ci (#10)

Add a .travis.yml file to validate for pep8, to run unittests for py27 and py35

Fix #9
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..de6e87b
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,12 @@
+language: python
+
+env:
+  - TOX_ENV=pep8
+  - TOX_ENV=py27
+  - TOX_ENV=py35
+
+install:
+  - pip install tox
+
+script:
+  - tox