Added: Pagination in category pages

I tried to use InfiniteScroll (#62) but due to how the code is made I couldn't.
We will have to change how pages are load and the way the movie list is made... so maybe in the future.

Right now is working with a pagination system:
![captura de pantalla 2014-03-01 a la s 12 29 31](https://f.cloud.github.com/assets/1398677/2301738/5407cb24-a156-11e3-9a76-83826f62da58.png)

Every category will have 5 pages.
There is a glitch that repeat 4 or 5 movies on each page. I think it must be something in <code>torrents.js</code> delivering repeated items or maybe in <code>listview.js</code> where the list is made.
Hope that someone can take a better look to this issue.

Anyway, now we can have nearly 250 movies per category.

I will report an issue with possible & future enhancements regarding this pull request.