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WaterManipulation and EarthBlast knockbacks

For Probending purposes, I gave them the same knockback as FireBlast.
(Uses FireBlast's config setting)
Properly give WaterManip and EarthBlast Knockbacks

They have their own config option now.
HealingWaters now effects all LivingEntities
Merge pull request #27 from MistPhizzle/master

Some Changes