Catch the error for an undefined class of org.bukkit.entity.Horse

Prevents pre-1.6.x bukkit servers from throwing errors on the missing Horse entity.
Merge pull request #20 from descention/patch-2

Catch the error for an undefined class of org.bukkit.entity.Horse
Fixed Siege inventory transfer to account for Armour slots. Minor fixes to permissions to use appropriate CreateClaims permission in proper circumstances.
Merge branch 'master' of https://github.com/Tux2/GriefPrevention
added missing semicolon. Fixed invalid method call used to add a new message.
fixed siege item transfer not working at all.
Merge pull request #3 from Tux2/master

Pull from Tux2