make a page for manual payouts

[chadwhitacre]

Low-hanging fruit before #22 is a page to update a participant's balance based on manual payouts.

[chadwhitacre]

I updated @steveklabnik's balance in the db before gittip #2 this morning.

INSERT INTO exchanges (amount, fee, participant_id) VALUES (-1.50, 0, 'steveklabnik');
UPDATE participants SET balance = balance - 1.50 WHERE id='steveklabnik';

That's what we need in the manual payout page.

[chadwhitacre]

Ice-boxing this. Let's get to #22 sooner rather than later.

[chadwhitacre]

Just did another one of these, for jnoller.

https://twitter.com/whit537/status/223077883554430977

[chadwhitacre]

This could go on the history page.

[chadwhitacre]

I made another $1 payment to @steveklabnik during Steel City Ruby Conf.

Now that we've automated withdrawals some of the pressure is off, but we do need to get something set up for international payouts.