Correct python virtual environment creation and application building #9
Description
Developers should be able to create a new project and pull in paas-skeleton, create an appropriate requirements.txt file and then run:
source env.sh
make
Sourcing env.sh should create the python virtual environment only and make should download and install their application's dependencies via pip.
Currently, paas-skeleton does not work in this manner. Sourcing env.sh breaks and some cleanup in the .paas-skeleton/python/virtualenv-makefile.inc is in order