Corruption, Drain Life, and Drain Soul

Fixes #72
Fixes https://github.com/Adirelle/AdiButtonAuras/issues/70#
Merge pull request #47 from arcadepro/du

Fixes https://github.com/Adirelle/AdiButtonAuras/issues/70#
Merge pull request #48 from nomoon/warlock

Warlock: Hand of Gul'Dan and Metamorphosis equivalent. (Includes #47)
Druid and warlock revision bump.
Merge remote-tracking branch 'arcadepro/lock'

Conflicts:
	data/Warlock.lua
Merge remote-tracking branch 'upstream/master' into warlock