Small bugfix

Update 1.2:
* Lots of code changes by Snowz

Update 1.1 changelog:
* Made code cleaner and added more comments explaining stuff
* Added list of commands to be executed upon joining on cake day
* Added a config option on how long after your cake day you can claim
* Added /receivedcake command which tells you on which years you received cake
* Firework now launches when you join on your cake day