(Semi-)Automatic tests

[Zomis]

It would be advantageous to have a way to test the system, to make it easier to make and test changes.

For example:

• Start server
• Send server some various implementations of a code challenges
• Perform games
• Assert something about the score (for example, if AI Loser and AI Extreme has been uploaded, AI Extreme should have higher rating than AI Loser)