[QAE1035] ability to withdraw an application

> As a Admin I want to be able to Note an application as being withdrawn so that I can ensure it isn't assessed

Also enhance seeds

[podio story](https://podio.com/bitzesty/app-qae/apps/stories/items/35)
remove direct work with database in acceptance test
Merge pull request #25 from bitzesty/QAE1035

[QAE1035] ability to withdraw an application