Support ComputerExtensionAttributes

This is a major refactoring and re-write.

• We now support ComputerExtensionAttributes

And, I've refactored the core of the tool in such a way that it is now hopefully simple to add support for other Version Control systems, or potentially support other types of JSS object.

I've also added lots of pytest tests, again with the hope of making it easy to extend the tool in future.

Git2JSS version 0.1.0

New Features:

Add support for storing passwords in keychain by default

Notable Changes

• Now uses the keyring module by default to safely store passwords (Issue #1)
• Use --no-keyring to revert to storing in plaintext if you really must
• Now licensed under GPLv3
• Various fixes to autopkg packaging

Diff against previous version:

v0.0.6...v0.1.0