Updated python testing versions

Author: Devin McGloin

.travis.yml

@@ -2,13 +2,16 @@ language: python
 python:
   - "2.6"
   - "2.7"
-  - "3.2"
   - "3.3"
   - "3.4"
   - "3.5"
+  - "3.6"
+  - "3.6-dev"  # 3.6 development branch
+  - "3.7-dev"  # 3.7 development branch
+  - "nightly"
 install: "pip install -r requirements.txt"
 script: py.test
 env:
   - SMOOCH_SECRET=smooch_secret SMOOCH_KEY_ID=smooch_key_id
 before_install:
-  - pip install -e .
+  - pip install -e .