Backend v0.2.0

• Added a demo feature. When enabled avaliable at /demo
• made a simple makefile for building releases
• Added build config in Cargo.toml
• Reworked lodaing of env variables
• Done more testing
• Fixed a few errors in the api

Backend v0.1.0

The api is functional, although many things are not yet done like token
blacklisting and SSL, this is good enough to start front end development.

I tried to design the underlying logic to be foolproof, and i've run some
tests but i don't consider this to be thoroughly tested.