Add onErrorReturn[Item] marbles
Updated Operator Matrix (markdown)
Add startWith marbles
Completable.sequenceEqual marble
Single.mergeArrayX marbles
Fix concatArrayEagerDelayError diagrams
Various delayError marbles
Merge branch 'master' of https://github.com/ReactiveX/RxJava.wiki.git
Add concatMapX marbles, fix some flatMapX marbles
M/S/C doOnLifecycle
Add ofType & filter marbles
Update Completable.toFlowable
Add/fix toFuture marbles
timestamp & timeInterval marbles
Add many fromX marbles
Add Maybe.dematerialize marble
M/S/C switchOnNext mables
RetryUntil marbles