Ensure pip is available

Yosemite needs it

Author: BanzaiMan

.travis.yml

@@ -42,6 +42,10 @@ install:
     brew uninstall pyenv
     brew install pyenv --HEAD
   fi
+  if ! python --version -m pip >&/dev/null; then
+    wget https://bootstrap.pypa.io/get-pip.py
+    python get-pip.py
+  fi
 - sudo -H python -m pip install virtualenv --upgrade
 
 before_script: