Fixes cancel button error on Action Sheet#1576

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bluehallu wants to merge 5 commits intoionic-team:masterfrom bluehallu:patch-2

+16-19

Commits on Jun 5, 2014

Fixes ionic-team#1013
hallucynogenyc
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Second fix
hallucynogenyc
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Fix cancel callback
hallucynogenyc
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Back button also triggers cancel callback now
hallucynogenyc
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Updated docs
hallucynogenyc
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