Added a Bukkit metadata API
Added arrows and wither skulls support to get/set_entity_spec
Added extension_exists
Fixed IndexOutOfBoundsException in function_exists and event_exists that was thrown when no argument was given
Fixed typo
Fixed infinite loops due to recursion and fixed typo
Better way to find the most specific class.
Fixed typo and added examples.
Pulled from upstream and resolved conflicts.

Merge origin/master

Conflicts:
	src/main/java/com/laytonsmith/abstraction/Convertor.java
	src/main/java/com/laytonsmith/abstraction/bukkit/BukkitConvertor.java
	src/main/java/com/laytonsmith/core/Static.java
	src/main/java/com/laytonsmith/core/functions/EntityManagement.java
	src/main/java/com/laytonsmith/core/functions/ExtensionMeta.java
Fixed typo in entity_spec documentation.
Added methods to Convertor to get a MCPlugin instance of CommandHelper, and its name from plugin.yml
Renamed the methods.
Merge pull request #223 from Veyyn/master

Added a Bukkit metadata API