UI improvements

* Sort `bets#index` table by columns
* JS to show invitee and inviter payouts as user changes odds value

@Clee681 There is one bug with this. When you click "Next" the first time after putting in a value for odds, and then promptly click "Back" on the confirmation view page, it doesn't look like the JS is getting called again so the odds calculations function doesn't take place.

Any idea how we can force the `document.ready` to get called again? (If that's even the issue...)