datasektionen/cashflow — pull request #121 by Frost (2014-12-16 23:18:25+00:00)
Title: Improve code quality a bit

CodeClimate had some things to say about a couple of methods.

I added tests for them, and tried to fix some of the issues.

* The mailer (Notifier) now actually has tests.
* The mailer got a major refactoring.
* Purchase.payable_grouped_by_person now has tests, and is a bit less messy.