CSLA collaborators

[rockfordlhotka]

I just created a "CSLA collaborators" team in the repo. Members of this time should appear in discussions with a Collaborator tag so people know they are active contributors.

Requirements to be in this team:

• I have a signed contributor agreement from you
• You have recently submitted a PR and so are an active contributor

This team has write permissions to the repo, and so I plan to keep its membership to active contributors. Don't want to fall into some insecure scenario like the poor guy that maintains the Linux xz repo!