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Fix Synchronous OnSubscribe Exception Skips Operators

Fixes https://github.com/ReactiveX/RxJava/issues/1816
Merge pull request #1817 from benjchristensen/lift-error-handling

Fix Synchronous OnSubscribe Exception Skips Operators
Fix Concat Breaks with Double onCompleted

Fixes https://github.com/ReactiveX/RxJava/issues/1818
Merge pull request #1819 from benjchristensen/issuje-1818-concat

Fix Concat Breaks with Double onCompleted
1.0.0-rc.9
1.0.0-rc.9
This doesn't belong here. Replaced by http://reactivex.io/documentation/Operators/operators.html