More precise marble diagram for the case when zip() takes an Observable that emits Observables
Merge branch 'master' of https://github.com/Netflix/RxJava into docs
* corrects grammar of sequenceEqual() javadoc
* updates link to wiki description of count()
* adds sample(sampler) marble diagram/wiki link
* adds longCount() marble diagram/wiki link
Merge pull request #597 from Netflix/docs

Javadoc updates (longCount, sample(sampler))