Added a blank 'server.ip' key to the default glowstone.yml.
Call PlayerMoveEvent.

Based partially on the code of @JeromSar. The event is called more often
than CraftBukkit due to the lack of movement buffering.
Added huge mushroom and more tree generation.

Includes a better generic tree system based on oak, small jungle, and
cocoa trees, as well as birch, tall birch, and spruce tree generation.
Now fires StructureGrowEvent during tree generation.
Added script that fetches Glowkit PRs for Travis.

For PRs, the PR body will be looked up and scanned for links to Glowkit
PRS, which will then be included in the build. Also reorganizes the Travis
script slightly.
Fixed PlayerMoveEvent handling and teleportation offset.

When PlayerMoveEvent's destination is changed, it should be considered a
teleport and fire the appropriate event and handle world changes.

PositionRotationMessage now refers to the client's feet instead of eyes.
Add basic random blocks tick
Add BlockCocoa, move random as protected static field to BlockType
Add BlockCrops
Add BlockMushroom
Add BlockSapling
Add BlockStem, remove BlockMelonStem and BlockPumpkinStem
Add BlockNetherWart
Add BlockSoil
Call BlockFadeEvent when soil turns back to dirt
Fix typo in BlockMushroom
Add BlockGrass (grass spread and decay)
Fix equality checks
Use an active chunks set for the block ticking
Lightning already have chunk coordinates