Commands:
/headdrop reload
/headdrop give <who> player <playername>
/headdrop give <who> mob <mobname>

Permissions:
tiaheaddrop.drop.mob (Can obtain mob head on kill, default true)
tiaheaddrop.drop.player (Can obtain player head on kill, default true)
tiaheaddrop.protect (Won't drop head on being killed)
tiaheaddrop.admin (Admin Commands)