Chain Subscription in TimeoutSubscriber and SerializedSubscriber
Reimplement the ElementAt operator
Add ElementAt and ElementAtOrDefault to rxjava-scala
Implement ElementAt as Operator
Pivot Unit Test
Add Javadoc to Pivot
Merge pull request #984 from benjchristensen/pivot-concurrency

Tests and Javadoc for Pivot
add marble diagrams to pivot() javadocs
Merge pull request #966 from zsxwing/elementAt

Reimplement the ElementAt operator and add it to rxjava-scala
Merge pull request #965 from zsxwing/fix-timeout-unsubscribe

BugFix: Chain Subscription in TimeoutSubscriber and SerializedSubscriber
Fix SynchronizedObserver.runConcurrencyTest

It wasn't waiting on all threads before emitting onCompleted.
Merge pull request #986 from benjchristensen/issue-985

Fix SynchronizedObserver.runConcurrencyTest