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.
Spigot POM Changes
Measure the duration of the entire timings run.
Add CustomTimingsHandler for adding new CraftBukkit custom timings
Make the plugin class loader thread safe
Merge branch 'master' of git://github.com/EcoCityCraft/Spigot-API

Conflicts:
	src/main/java/org/bukkit/command/defaults/TimingsCommand.java