Merge pull request #39 from ov3rk1ll/master

FixedChest Command and some cleaning up
Fix add chest loot command
Use doubles

Begin removing redundant code
ConfigurizationSerializable!
Do this right
Don't use INSTANCE in GameManager
Small changes
Needs to full path
Allow implicit data types in config
This is auto_join not auto_join_allowed
Fix resetting
Cleanup stuff from Pull Request

Update CHANGELOG
Working towards 1.0-dev
Added grace messages and lightning
Added config for lightning count and delay
Added lang for grace start and grace end