fixtures for deploys/jobs

part of our core models, they should have fixtures ...

+ bugfix bypass_email triggered on pending deploys in non-production

@steved555 @pswadi-zendesk @jwswj 

### Risks
 - None
`delete_all` doesn't trigger Rails callbacks http://edgeguides.rubyonrails.org/active_record_callbacks.html#skipping-callbacks