Fixed no HTTP proxy case.
Added app_interface.

New 'systempkgs' parameter will call virtualenv with the
'--system-site-packages' option, which can greatly speed up creation in
some cases.

The idea is to be able to use a different template, in case the one
provided with the module doesn't fit the user's need.

Gunicorn and virtualenv additions

* 'master' of github.com:stankevich/puppet-python:
  updated authors.
  python::gunicorn - added template parameter
  python::virtualenv - '--system-site-packages' option
  python::gunicorn - removed unused/undocumented attributes.

There was a dependency between python::virtualenv and
python::requirements. Basically, the virtualenv wanted to initialize
requirements, but requirements depended on the virtualenv being created
already, resulting in:

err: Could not apply complete catalog: Found 1 dependency cycle:
(Exec[python_requirements_check_/usr/share/err/repo/requirements.txt] =>
Python::Requirements[/usr/share/err/repo/requirements.txt] =>
Exec[python_virtualenv_/usr/share/err/python3] =>
Python::Requirements[/usr/share/err/repo/requirements.txt] =>
Exec[python_requirements_check_/usr/share/err/repo/requirements.txt])

pip install distribute currentlyfails on Python 3, this way people can
skip installing it. It's included by default to remain backward-
compatible

Allow virtualenv definitions to share the same requirements file

Make pip install distribute in a virtualenv optional

Add search path to virtualenv setup command.

…and not found

python::requirements Error: Parameter cwd failed on Exec for virtualenv=system