Remove trailing whitespace from mail templates.
Tests: replace ftw.testbrowsers `normalized_text` (deprecated) with `text` (new).
Add tests for confirmation and shop owner mails.
Make phone number in customer confirmation mail configurable and optional.
Pyflakes cleanup.
Merge pull request #17 from 4teamwork/jone-phone-configurable-in-mails

Make phone number in customer confirmation mail configurable and optional