Adding stroke number to rowing extension#1

Merged

MathildeJ merged 5 commits intomasterfrom

feature/AddingStrokeNumber

Feb 27, 2018

Commits on Feb 27, 2018

creating SZStrokeNumber class to serialize stroke number
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adding stroke number to rowing trackpoint
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removing unused constructor
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using null stroke number by default
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fixing test (stroke number not appearing if not added to builder)
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