Added support to handle persistent living entities.
Updated Entity setRotation and getRotation to use Vector2f as entities

only use yaw and pitch but not roll.
Move Contribution Guidelines to SpongeDocs
Update Checkstyle and enable settings
Fix some of the checkstyle warnings
Move plugin workspace setup to SpongeDocs
The concept of environments.
Merge pull request #311 from CraftStone/master

The concept of environments.
Add getter for entity class in EntityType
Expand Block/Item interfaces
Merge pull request #309 from Deamon5550/feature/block-expansion

Expand Block/Item interfaces
World Generator API
Add Aerial, Ambient, Aquatic, and Boss.
Update art names to match minecraft names - Thanks @AIOOB
Fix Javadoc error in EntityMoveEvent.
Add extended particles api. (#323)
Remove FusedExplosive#ignite as a FusedExplosive is already ignited when spawned.
Add IgnitableExplosive to represent entities that can be ignited.
Implement an event factory utility class and fix PlayerUpdateEvent.

PlayerUpdateEvent did not implement PlayerEvent.
Add Selector API. Merges #297, Closes #294