Pip installation lacks __init__.py file

[azmeuk]

Hi. It seems that pip installations do not install __init__.py. So if you run a python scripts depending on supervisor, with python -Wall (for instance, some django tests with django-supervisor installed) you can have the following warnings:

  file, filename, etc = imp.find_module(subname, path)
/usr/lib64/python2.7/pkgutil.py:186: ImportWarning: Not importing directory '.../env/lib/python2.7/site-packages/supervisor': missing __init__.py

virtualenv env
source env/bin/activate
pip install supervisor
ls env/lib/python2.7/site-packages/supervisor

Is there a problem with the pip installation ?

[mnaberez]

Duplicate of #660.