Rudder

To ensure our code is clean and correct we should use a Scala style checker.

This would allow us to automatically:

- Avoid trailling whitespace character.
- Remove unused import
- Organize imports
- Correct indentation

- Add Override and Deprecated annotation ?
- Remove unnecesseray cast ? (don't know if it applies in Scala ...,
I would prefer something that add automatic types on method declaration and remove unnecessary type on values)

You can use that ticket to add ideas, or comment those i propose here.

I will add a first example soon