Use Case - User Added/Removed from v5 Project

[rootelement]

Need to update the https://github.com/topcoder-platform/resource-processor to listen to v5 Project bus messages to add/remove people as they’re added/removed from the project. Must follow all the rules set in #358 and #359

[ThomasKranitsas]

PRs:

• user access updates #366
• user access updates legacy-challenge-resource-processor#19
• user access updates resource-processor#11

cc @rootelement