This adds documentation for the fromEvent operator. The documentation has been partially rewritten
to clarify certain parts a bit more. This change will close issue ReactiveX#78

There were still a couple of examples necessary for the fromEvent operator. These have now been
added

…handler with more than one argu

Added a small jQuery example that creates and triggers an event handler with more than one argument.

The example of a non-one argument event handler, written with jQuery was breaking the flow ot the
text. Moved it below the event targets and added a small reference in the source text to continue
reading below.