Public API (NEST-344)

[humanoidcreature]

For our users, for external use.

• Create/stop/delete tenant.
• Turning on/off features (paid features, e.g. for custom domain usage the automated payment should be done).
• With the help of Azure API Management: http://theundocumentedapi.com/2014/08/18/api-management-made-easy/.

Jira issue