Deleting users/accounts
Summary:
- Implement proper users listing, added tests for it
- Deleting users/accounts
TODO: more browser tests
Test Plan: ./phpunit
Reviewers: #hkccp_developers, vanmeeuwen
Reviewed By: #hkccp_developers, vanmeeuwen
Subscribers: vanmeeuwen, #hkccp_developers
Differential Revision: https://git.kolab.org/D1000