Use a Session class on the server
Use RSpec to test the new Session class

- Install RSpec
- Rearrange directory structure
- Write a spec for Session
Install the Ruby debugger
Implement some unit tests for Session
Use the new Session class properly
Remove Session#to_hash, not uself

It just makes the GET / action less clear
Add more unit tests to session_spec
Send and set duration
Refactor and send the duration to the clients on start
WIP: Use Piecon
Finish implementing Piecon