Merge pull request #803 from benjchristensen/0.16.x

Add testMultipleWithSameCause UnitTest
Issue #799 - Commenting out the call to attachCallingThreadStack when constructing a CompositeException
Fixed SafeObserver tests dealing with Exception structure
Adding comment to CompositeException
Merge pull request #825 from mattrjacobs/0.16.x

Issue #799 - Commenting out the call to attachCallingThreadStack when co...
Perf Tests