Cleanup, restructuring and moving service from ASP.NET MVC to Nancy

This PR includes multiple huge, but necessary changes to the project structure and technologies:
 - [x] Ported service project to Nancy
 - [ ] Written tests for all Nancy modules
 - [x] Restructuring of the project structure (src, test, build, tools, etc. folders)

The Nancy service is not yet fully up and running and the client is not updated to use the new routes on the service.