Simulations are the container for simulation models

Rename app.js back to server.js.

Rename server.js to app.js.
Add 404 and error handling middleware.

Add cors package.
Add /users/me route to identify from auth token.

Add UML class and use-case diagram (StarUML application).
Add admin user from config if no admin user found.

The higher the level, the more rights a user has
Fix error not checking password in authenication

User passwords are stored with bcrypt hash & salt.
The authentication token is stored in the 'x-access-token' header.

For tests open mongodb port and access directly (without docker)