Cleanup/Speedup Montage.defineProperty()#1859

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marchant wants to merge 2 commits intomontagejs:masterfrom marchant:speedup-define-property

+54-51

Commits on Sep 8, 2017

Fixes a bug that would cause unwanted removal of all items because of a precision logic error
marchant
committed
streamlines Montage.defineProperty() and adds an optimization to bypass Object.defineProperty() when possible
marchant
committed