new View needed: meeting / presentation mode

[ywwg]

Right now we're using the admin panel to run our meetings, and that's really suboptimal. The navigation is awkward and there's information in the admin view that we don't need to show to the whole voting committee. We should make a purpose-built view to run the meetings that only admins can access. Main design goals:

• Be able to see the proposals we care about for that specific meeting, run through them, and ask questions of the artists. Optimize for a full-screen projected situation with big fonts and without need for browser tabs.
• Support both meeting 1, where votes are hidden, and meeting 2, where we start sorting things. Probably need client-side table sorting to make the best use of this
• Maybe have some sort of frame view so that we can easily bounce between proposal pdfs and not keep juggling tabs
• Only surface information we absolutely need to see during the meeting -- keep it clean.

We can start with the Index view of the admin controller as a base, but remove a lot of the extra cruft we don't need.