Ensure pip is installable with sudo

Author: BanzaiMan

.travis.yml

@@ -44,7 +44,7 @@ install:
   fi
   if ! python -m pip >&/dev/null; then
     wget https://bootstrap.pypa.io/get-pip.py
-    python get-pip.py
+    sudo python get-pip.py
   fi
 - sudo -H python -m pip install virtualenv --upgrade