rel next and rel prev is added to the links

rel next and rel prev is added to the links
This rel attribute is important to create search engine friendly pagination read [here](http://googlewebmastercentral.blogspot.in/2011/09/pagination-with-relnext-and-relprev.html)
Merge pull request #37 from gchokeen/master

 search engine friendly pagination link attributes

While this will probably of little use because the search engines don't see pagination generated by JavaScript, it's a nice addition nevertheless.