Add thread safety#31

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mwoollard wants to merge 6 commits intoAliSoftware:developfrom

mwoollard:develop

Commits on Dec 19, 2015

Add thread safety
Mark Woollard
committed
Switch lock to NSRecursiveLock and make thread safety configurable
Mark Woollard
committed
Add unit tests for thread safety and timing
Mark Woollard
committed

Commits on Dec 20, 2015

Incorporate feedback from @ilyapuchka
Mark Woollard
committed
Updated thread safety unit tests
Mark Woollard
committed
Update thread safety test to check resolving dependency on separate thread
Mark Woollard
committed