Composite exception should update cause to match the correct throwable that's first in the chain#3963

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premnirmal wants to merge 2 commits intoReactiveX:1.xfrom

premnirmal:composite_exception_cause_fix

Commits on May 25, 2016

cause should be the selected chain, not the original composite exception
premnirmal
committed
Cause should be the first throwable in the list of causes. Added test to check the cause
premnirmal
committed