Merge 'first' Operator#362

Merged

benjchristensen merged 4 commits into

ReactiveX:masterfrom

benjchristensen:operator-first-merge

Sep 10, 2013

Commits on Sep 8, 2013

Added the two variants of the first operator.
jmhofer
committed
Added FirstOrDefault operation
jmhofer
committed
Added link urls to the msdn descriptions
jmhofer
committed

Commits on Sep 10, 2013

Merge branch 'first-firstDefault' of git://github.com/jmhofer/RxJava into operator-first-merge
benjchristensen
committed