helpers added
pythonbrew_setup resource added - installing pythonbrew for specified user or globally for 'root' (/usr/local/pythonbrew)
pythonbrew_python resource added - installing python versions
pythonbrew_venv provider added - creating/deleting pythonbrew venvs
:switch action added to pythonbrew python
pythonbrew_pip resource added: install and uninstall actions supported
recipe fixes
providers/setup fix
pythonbrew_setup, pythonbrew_python, pythonbrew_venv and pythonbrew_pip resources added