Pull Request #659 Pagination on category products grid-view or list-view

When Pagination is used on a Product Category page, it would be great to also have the number of items shown on the current page. For example, if the number of products to show per page is 6 and there are 13 products in the category:

Pages: 1 2 3 Next > Last » 1-6 of 13

For this purpose, we added an additional option on the Administration Dashboard's Settings -> Store -> "Presentation" tab, in the Pagination Settings section. When the option to "Use Pagination" is selected, an input box appears to set the number of products to show per page (existing behaviour). We added another radio button option immediately underneath for displaying "x to y of total products".

Screenshots:

Dashboard - Settings - Store - Presentation:
![settings - store - presentation tab](https://f.cloud.github.com/assets/3219370/1240180/1b58d654-2a07-11e3-9867-bf23780ad227.png)

Dashboard - Settings - Store - Presentation - Pagination Settings:
![settings - store - presentation - pagination settings](https://f.cloud.github.com/assets/3219370/1240187/45d26878-2a07-11e3-85f7-3bd961995e1c.PNG)

Theme Twenty Thirteen Example:
![twenty thirteen example](https://f.cloud.github.com/assets/3219370/1240191/58edac06-2a07-11e3-8486-94c7ef3d00d4.PNG)

Theme Twenty Twelve Example:
![twentytwelve example](https://f.cloud.github.com/assets/3219370/1240193/5dd38916-2a07-11e3-8975-bfa57505f5f2.PNG)