pinned pip to 8.1.2 because of #58

cmake/catkin-pip-base.req

@@ -1,4 +1,4 @@
 # Basic tools to install, simulating virtualenv creation behavior.
 # Not setting any version here to force catkin-pip to follow python and not remain stuck on deprecated versions.
-pip
+pip==8.1.2  # pip > 9.0 tries to remove egg-info/entry_points.txt from /opt/yujin/amd64/indigo-devel/lib/python2.7/dist-packages/pyros-... even if we specify /home/alexv/ROS/gopher_bootstrap/build/catkin_pip_env/bin/pip install -e /home/alexv/ROS/gopher_bootstrap/src/pyros --ignore-installed --no-dependencies --prefix /home/alexv/ROS/gopher_bootstrap/devel
 setuptools