Fix invalid integers in spawnpoint command. Fixes BUKKIT-3509

getInteger returns min value on illegal number formats, so we change
behavior to throw an exception when requested.
Updated version to 1.4.7-R1.0 in pom.xml for RB.
Merge tag '1.4.7-R1.0' into 1.4

Jenkins build #1679

Conflicts:
	pom.xml