Don't allow nulls in PlayerRespawnEvent. Fixes BUKKIT-2571
Updated version to 1.4.6-R0.2 in pom.xml for Beta.
Updated version to 1.4.6-R0.3-SNAPSHOT for development towards next release.
Updated version to 1.4.6-R0.3 in pom.xml for Beta.
Updated version to 1.4.6-R0.4-SNAPSHOT for development towards next release.