New config

[dorner]

Pull Request Template

Description

Fixes #18. Backwards compatibility should be completely transparent due to deprecation capability.

This introduces essentially a brand new configuration framework. We can consider breaking this out into its own gem which would be neat since it does things that (AFAICT) no other configuration gem does.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

How Has This Been Tested?

Local testing with existing Deimos app as well as new unit tests.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[dorner]

Thanks for the comments @colinmroberts! Will address this week hopefully.

[dorner]

@colinmroberts addressed the comments; can you give it another look?