Make apt-get test to apt

Merge pull request #34 from Smattr/83BDABA0-B242-46E8-A0AB-B2C3DAB5482A

add support for MacPorts

Version 2.1

Version 2.0

Remove '?' as a caller to reduce confusion

Fixed npm autoremove bug

Fixes #7

Added feature to change to package manager

Fixed upgrade_pkg xbps bug

1.0 Release