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Fix stale RSVP counts used on count updates - #93
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If two users concurrently RSVP to a huddl, the count will not update correctly. The user that RSVPs with a stale count will update the count based on the local changeset, wiping out count updates that have occurred since the last page load. This change shifts increment and decrement actions to Postgres so the client isn't providing a hard value for the count.