Create sudo page for membership updates

This would need both API and front end updates, but we should allow for a class of sudoers that have access to an admin section. This would allow us to proxy update memberships, access reports, and do other tasks through the web portal rather than having somewhat kludgey updates for edge cases. I would add a new flag to the userinfo object along the lines of "sudoer"=>true/false. This would be imposed at the API level obviously, but this would allow Zhou to filter and show different admin tools when one is logged in (like webdev or Zahra).

@cguindon WDYT?