updating alphabetical list to match RxJava wiki

mostly just a “baby’s first check-in” how cute commit ;-)
Merge pull request #57 from staltz/master

Set maximum height for frontpage jumbotron.
Two new Catch diagrams

What do you bet that asterisk will cause me some headaches later on?
Defusing ticking time bomb

…on second thought
Merge branch 'master' of https://github.com/ReactiveX/reactivex.github.io
adding various Catch diagrams
template for operator pages
Work in progress: documentation page for "Catch" operator (and onError..., etc.)
new diagrams for Catch variants
Finish first draft of Catch operator web page.
adding diagrams for Concat operator
restore catch_exception
Add first draft of documentation for the Concat operator.
Add info to Catch operator page about in which RxJS distributions the operator can be found.
...and going back to spelling skool
diagrams for Retry operator
wiki-documenting the Retry operator and its cousins retryWhen and retry_infinitely
a variety of Merge operator images
more Merge-related diagrams
add Merge operator wiki page
some small changes to other operator pages
fixing broken HTML tags