Stopwatch / Countdown - Precise timers#13

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jchavannes wants to merge 2 commits intoupdatefrom

Commits on Mar 16, 2015

Adding stopwatch and countdown classes for more precise timing while still keeping old timer class for reverse compatibility
jchavannes
committed

Commits on Mar 17, 2015

Adding usage and renaming to lowercase
jchavannes
committed