Merge pull request #2369 from dhermes/group-pip-travis

Grouping pip upgrades on Travis.

Author: dhermes

.travis.yml

@@ -2,8 +2,7 @@ language: python
 sudo: false
 
 install:
-  - pip install --upgrade pip
-  - pip install --upgrade tox
+  - pip install --upgrade pip tox
 
 script:
   - tox -e py27