Modernize, refactor and get the 2017 API projects able to pass through Travis testing again

[MikeTheCanuck]

Brian has been on a rampage lately, modernizing the hell out of the 2017 Emergency Response API repo: https://github.com/hackoregon/emergency-response-backend/pull/119 https://github.com/hackoregon/emergency-response-backend/pull/121

This is in part in response to the problems we're having with last year's projects requiring access to a test DB, which we no longer support: https://github.com/hackoregon/civic-devops/issues/59#issuecomment-394142231 (and the fact that we're migrating the databases one at a time from their old EC2 instances to the new shared beast)

It's safe to assume similar fixes could be made to the rest of the 2017 API repos, to get them to a point they can be supported again:

• [x] team-budget
• [x] emergency-response-backend
• [ ] teamHomelessness
• [ ] housing-backend
• [ ] transportation-backend

List of fixes to implement

• remove test database dependency by refactoring project to use pytest runner such as Brian implemented here