updates and corrections, +phantom ops page
Merge pull request #63 from staltz/develop

Changed uppercase to lowercase in directory documentation/Operators
Merge branch 'develop' of https://github.com/ReactiveX/reactivex.github.io into develop
RxJS backpressure operator diagrams
page to describe various backpressure-supplementing operators (not the page about the topic of backpressure & reactive pull)
+ update operator template page to reflect new page design