Added API to set the name of an inventory

This does not work for all types of Inventories due to a minecraft limitation (Such as Furnaces). This commit will allow players to change the name (title) of inventories.

Bukkit PR:
Jira: 
CraftBukkit JAR: http://www.box.net/s/hyxxahireydsbagvox22
Test Plugin (all chests titles will be renamed): http://www.box.net/s/azf35yocux0tog4liifh