updated to use MacAdmins Managed Python 3, instead of deprecated Pyth…

…on 2.

fixed dmg re-packaging

support for xip archives

consolidated bugfixes

fixed symlink handling

now works with .app input again

0.4 release

- add option to add scripts (--scripts, like the scripts folder)

- add option to add --preinstall script
- add option for --postinstall script
- support the --ownership flag
- option to output pkg to a different dir than cwd

pushed to github, new version

0.1! it does something, most of the time\!