Add new setResourcePack method. Fixes BUKKIT-5015

Minecraft now uses resource packs instead of texture packs.

This commit adds a new method specific for resource packs, and deprecates
setTexturePack.
Updated version to 1.7.2-R0.1 in pom.xml for Beta.
Updated version to 1.7.2-R0.2-SNAPSHOT for development towards next release.