update api structure

[lwhiteley]

Thanks for this great starter.

I added some changes that i think may be beneficial

Changes:

• Update structure of the api to a folder per path, makes it easier to maintain related files, instead of searching multiple folders for related files
  • services, model, various tests, conteollers and route can all live in one area
• iterate over routes to append to express (reduces changes to server.js for additional routes)
• only add dummydata in development (This was failing the tests by adding two extra posts when the tests started)
• Another thing failing the tests was the beforeEach was not using async-await for the async functions, which gave variable results for the tests. Now its consistent!
• Some of the other tests did not wait on the respective posts to be created either. so added await

Can discuss but i find this a little easier to manage