Add twitter bootstrap and implement modals
Add status changes and tests
Don't store the payment url for docdata webmenu.

The url can't be used after the payment attempt and it can be regenerated based
on the information in the models. Therefore, there's no reason to store it.
Bug fixes for status updates from DocData.

BB-285 #resolve
Sepa app to create xml for bankpayments
Add configuration to log payment status changes from DocData.

BB-282 #resolve
Don't create a docdata payment order in update_payment_status().
Don't use spaces in merchant_order_reference.
Discard unused bootstrap stuff
Login form prettified
Added bootstrap js files for specific inclusions
Rearranged sass files to have a clearer modular structure
Remove commented out code.
Tweak status log config.
Fix bug in cowry log config.
Fix csrf for login