added onUpdate callback support & relevant test#562

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ddankwerth wants to merge 2 commits intokrispo:masterfrom

ddankwerth:feature/on-update-callback

Commits on Oct 19, 2016

added onUpdate callback support & relevant test
David Dankwerth
committed

Commits on Nov 3, 2016

resizeHanlder now called the scope.api.update rather than the nvd3 update so that onUpdate callback will be called (if present)
David Dankwerth
committed