only one column is editable at a time
editable columns have a different appearance from locked columns
any column can be edited by anyone via an edit button
columns and rows require confirmation before deletion
This changeset applies new styles to the poll.
it also uses the new asynchronous wrappers around the localStorage api.
this is necessary because we're migrating to a storage system that will
use an async api.
The changes to the poll just happened to coincide with the async stuff.
My apologies to anyone who wants to read this whole thing
