Adding more environments to Travis

.travis.yml

@@ -1,6 +1,26 @@
 language: python
-python:
+
-- '2.7'
+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      sudo: required
+      python: 3.2
+  include:
+    - os: linux
+      dist: trusty
+      sudo: required
+      python: 2.7 
+  include:
+    - os: osx
+      osx_image: xcode7.2
+      sudo: required
+      python: 3.2
+  include:
+    - os: osx
+      osx_image: xcode7.2
+      sudo: required
+      python: 2.7
 
 before_install:
   - sudo apt-get update