Add a Page Navigation Brick

STR
* Add the Page Navigation brick
* Create an app that has a couple of pages
* Link a button to the Page Navigation brick and
  * Try to navigate to a specific page by sending the Page Navigation a number
  * Try to navigate to a previously open page by sending the Page Navigation a signal on it's "Previous Page" listener

Please let me know if STR too vague or having trouble, thanks.
nit: parseInt(page,10)