Fix for spawning and active chunks
Use only x and z coords for speed check
Disable chunk grace by default
Added flag to enable java's contention monitoring
Add hook for thread contention monitoring
Use thread-safe method for iterating over chunks when saving. Added config option to disable async chunk loading.
Removed maven purge step now that SpecialSource is no longer snapshot
Update to Forge 965. Fixed MFR world issues with plugins. Fixes #482, #475, #272

MinecraftForge/MinecraftForge@2f7ad51a025c5af5fca489489c34e7f30ecb15c2
MinecraftForge/FML@f1b3381e61fac1a0ae90f521223c6bc613eb4888

* Fixed NPE's when plugins tried to retrieve craftworld from entities in MFR proxy worlds.
These entities will now return overworld's craftworld as their default.
Apply spigot patch for disabling structure save info
Fix for spawning and active chunks
Updated final filename in pom
Added optimizations from evoc (thanks to ProfMobius)