Tucked the check payment options into the payment methods table.
Added zip code field to check mailing address.
Added check details to admin.
Added status messages to the top of order summaries.
Made the status indicator on the payment page more specific:

In cases where there is an outstanding check payment, the status indicator now gives instructions for mailing a check.
Payment.CHECK instead of "check"
Merge pull request #261 from littleweaver/check_payments_spitshine

Check payments spitshine
Added unconfirmed_check_payments to order summary data.
Merge branch 'master' into ticket/124

Conflicts:
	brambling/models.py