Also update setuptools with pip

.travis.yml

@@ -43,7 +43,7 @@ jobs:
   fast_finish: true
 
 install:
-  - python -m pip install -U pip
+  - python -m pip install -U pip setuptools
   - pip install -r requirements/ci.txt
 
 before_script:

CONTRIBUTING.rst

@@ -35,7 +35,7 @@ You want to contribute some code? Great! Here are a few steps to get you started
 
       $ virtualenv venv
       $ source venv/bin/activate
-      (venv) $ python -m pip install -U pip
+      (venv) $ python -m pip install -U pip setuptools
       (venv) $ pip install -U -e .[validation]
       (venv) $ pip install -U -r requirements/dev.txt
 

README.rst

@@ -294,7 +294,7 @@ For additional usage examples, you can take a look at the test project in the ``
    $ virtualenv venv
    $ source venv/bin/activate
    (venv) $ cd testproj
-   (venv) $ python -m pip install -U pip
+   (venv) $ python -m pip install -U pip setuptools
    (venv) $ pip install -U -r requirements.txt
    (venv) $ python manage.py migrate
    (venv) $ python manage.py shell -c "import createsuperuser"