Add onTopHandler functionality.#46

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SMHFandA wants to merge 2 commits intomarkgoodyear:masterfrom

SMHFandA:master

Commits on Oct 27, 2015

Add onTopHandler functionality.
SMHFandA
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Commits on Nov 8, 2015

Add ontop.scrollup event. Modify readme and demo. Update devDependencies.
SMHFandA
committed