Slimes now have dynamic health

Signed-off-by: Justin Wiblin <Justin_wiblin@hotmail.co.uk>
Ghasts and the ender dragon now have dynamic health, the health increase system will be changing soon, need to work out a good balance

Signed-off-by: Justin Wiblin <Justin_wiblin@hotmail.co.uk>
Merge pull request #16 from Thelonedevil/combat

Combat
updated to forge 1190

Signed-off-by: Justin Wiblin <Justin_wiblin@hotmail.co.uk>
Merge pull request #17 from Thelonedevil/Quests

updated to forge 1190