Basic MostRecent implementation
Unit tests for MostRecent Operator
Updated Observable API
Implemented GetIterator operation
Implemented Defer Operation
Merge branch 'getiterator' of git://github.com/mairbek/RxJava into GetIterator-review
Refactored Iterator implementation out of Observable into OperatorToIterator

- Trying to keep the massively large Observable.java class focused on the API and implementation details off in small classes.
Merge pull request #178 from benjchristensen/GetIterator-review

Review and Refactor of GetIterator
Merge pull request #171 from mairbek/defer

Implemented Defer Operation
Merge pull request #168 from mairbek/mostrecent

Implemented Most Recent