If the enum passed in is null, just return null too.
Make player_death use detailed 'cause' array, add item_spawn event
Merge pull request #123 from jb-aero/master

Add item_spawn event, bring player_death up to par with entity_death
Merge branch 'master' of git://github.com/sk89q/commandhelper.git into backport-1.4.7
Updated dependency versions.

All dependencies have now been updated.
Add update guideline to pom
Revert upgrade of snakeyaml.
Merge branch 'master' of github.com:sk89q/commandhelper.git
Merge from master.