Added new features, bug fixes and further improved the code

* changed library name
* Notification Center support
* added more utility methods
* changed "get_result" to "add_result" to avoid confusion
* fixed shell script calls to use quoted forms of text
* default icon bug fixed, now shows the default icon if no icon value
is passed
* completed the documentation to include examples for all utility
methods as well
* commented the iTunesRatings example for easier understanding of how
to use the library