Merge pull request #565 from mcmonkey4eva/master

Pull request full of dMaterials
Merge pull request #566 from mcmonkey4eva/master

More properties, more materials, more fun!
Save a get operation in ScriptEntry#getNext() - this seems to be the bottleneck for Denizen, so perhaps could look into using a Queue or entry head index in the future
Fix a minor error in the health command

Woops, my bad!
Doesn't seem to be a disruptive error, just throws a stacktrace and
moves on (according to the user who found it)