Add till'#115

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Shou wants to merge 6 commits into

haskell:masterfrom

Commits on Sep 23, 2015

Add skipTill and skipTill'
favonia
committed

Commits on Mar 30, 2016

Commits on Apr 23, 2016

WHNF on skipTill' p
Shou
committed

Commits on Jul 1, 2016

skipTill': WHNF a, not m a
Shou
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