added use-case as field for layers

used prance to resolve the yaml file (enables file-splitting)

added global security definition to swagger.yml

added token verification stubs

added security jwtRegular to all endpoints

certificates itself are ignored for safety reasons

Used on ports :80 and :443.

Connected Cluster and Similarity functionalities

See merge request !12

- extracted security definition from swagger.yml into security.yml
- added seperate functions to verify tokens for a constant role
- added security definitions to protected endpoints

added generation of JWT tokens

added options to:
- add user
- delete user
- fetch users
- authenticate with username/password