Add Organizations Support

[cookrn]

Users should be able to archive repositories for organizations if either of two conditions are met:

• A user is a member of the "Owners" team on the organization
• A user is a member of the "Archivists" team on the organization

A user should be able to manage an organization's subscription if they are a member of the "Owners" team on the organization

[cookrn]

Fixed By: https://github.com/cookrn/Antiqua/commit/3a6195dc41fb30f9b9b937dfa16911ddb9556b96

[cookrn]

Also Fixed By:

• https://github.com/cookrn/Antiqua/commit/620ee392ce7b757fd16d8e79ec197d7efeb75114
• https://github.com/cookrn/Antiqua/commit/b72c2177f0a1ad9219a7f172a68015a236cbb78f
• https://github.com/cookrn/Antiqua/commit/f0fe2c0319349fdaad96031d65a27a6bf412989a

[cookrn]

Still TODO -- organization subscriptions