Update commands for iam&rm

[ewoutp]

https://arangodb.atlassian.net/jira/software/projects/OAS/boards/9?selectedIssue=OAS-113

• [x] update organization
• [ ] add organization members
• [ ] delete organization members
• [x] update project
• [x] update role
• [x] update group
• [ ] add group members
• [ ] delete group members
• [x] add policy binding
• [x] delete policy binding
• [x] ListMyOrganizationInvites

[jasons2019]

Note: I believe these items can be closed, because of the following existing commands:

• ListMyOrganizationInvites
  • oasis list organization invites
  • oasis list organization members
• add policy binding
  • oasis update policy add binding
• delete policy binding
  • oasis update policy delete binding

[ewoutp]

Unchecked commands in summary are still missing.