build_url path defaults to '' now, fixed PyCharm issues parsing INSTALLED_APPS.
Working on cleaning up payment platforms, Completed braintree transaction authorization.
Switched to using tokens in /donation/* pages, Fixed issue in [database.sql_auto_increment] when the table is empty, Implemented braintree [donation_confirm] and [donation_update] functions.
Added confirmation form to [donation.confirm], which is setup by setting 'donation_confirm_form' to a Form class.
Few small pylint/pep8 fixes