CUNY Academic Commons

Added in https://github.com/cuny-academic-commons/cac/commit/bf78cd1964726f1596a522379e8b8d646c0a4535. It will be available after today's release. (Side note: it's a cool plugin. Scott, you should take it for a test run after it's up, and think about writing a codex page for it, as I think it'd be useful to a lot of Commons members.)