No longer should need references to self in tabs.
Do want canceled offers to show as a side effect, just not on OfferCancel txs.

Offer cancels could happen on certain other transaction types in the future, most notably Contract transactions.
Guard/livereload should watch for changes in config file.
Optimize loading order. Makes client startup feel much much faster.

We're loading different things at startup: account info, trust lines, offers and
transaction history.

Previously, we were loading account info last, even after loading the whole
transaction history. That made it seem like the client took forever to
initialize and recognize that your account is funded.

Instead, we now load account info first to get the correct front page showing.
Next we load trust lines to get all the balances set up. Then we load
transactions, because they're visible on the front page. Finally we load offers
which are invisible until you go to the Trade page.