TS-4532: static type checking for time#1

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SolidWallOfCode wants to merge 3 commits intomasterfrom

Commits on Sep 6, 2016

TS-4532: Static type checking for time.
SolidWallOfCode
committed
TS-4532; Trying out using ink_zero overload to set durations to zero.
SolidWallOfCode
committed

Commits on Sep 7, 2016

TS-4532: More tweaks.
SolidWallOfCode
committed