bugfixes:
- win_chocolatey - fix issue where state=downgrade would upgrade a package if no version was set

minor_changes:
- win_chocolatey - Add support for username and password on source feeds
- win_chocolatey - Add support for installing Chocolatey itself from a source feed
- win_chocolatey - Removed the need to manually escape double quotes in the proxy username and password
- win_chocolatey - Will no longer upgrade Chocolatey in check mode
- win_chocolatey - Added ability to specify multiple packages as a list in 1 module invocation