Issue title: Users have icons
 Issue body: The icons at the bottom of the retro use the OAuth provided icons if they exist.
 Comments: 
 Comment 0: implemented long ago!
{'source': 'GithubIssues', 'repo_name_with_owner': 'stride-nyc/remote_retro', 'issue_id': 223468139, 'repo_stars': 540.0}