Merge pull request #13 from AADOJ/GGJ

Forgotten and lonely curlybracket left out in the wild
Added exception for when a slot is occupied. Added a try/catch for it in ConsoleUI, and added a test to check if it is thrown.
Merge pull request #14 from AADOJ/snaebjorn

Added exception for when a slot is occupied. Added a try/catch for it in...
Fixed issue with round when inserting on an occupied slot