Under the covers Ender Pearl teleportation hook
- Worked this up to get more control over the velocity. Only checking
  it in as a reference for later. The Bukkit-only velocity modification
  should work fine.
Merge alternative EnderPearl elevation velocity adjustment

Conflicts:
	src/main/java/com/untamedears/humbug/Humbug.java
Update new ender pearl velocity for 1.6.4.R3
Ender pearl updates

- Switch to alternative pearl gravity code
- Switch to flat 10sec pearl cooldown + combat-tag on player