Added support for disabled class in "<<" "<" ">" ">>"

If is fist page disable "<<" and "<" links and if is last page disable ">" and ">>"
Corrected support for adjacent

If we had 15 pages with 2 adjacent itens on page 5 it was showing [ 1 | 2 | 3 | 4 | .5. | 6 | ... | 14 | 15 ], the 5 page actualy didn't have the 2 adjacents at the end, and the same was happening to the end.
Changed "<span>" to "<a href=''>"to get cursor pointer
Merge pull request #3 from AlanRezende/master

Awesomeness - Still new at git so lets hope all this works out :) I'll probably tweak the support on the disabled class and might switch the a href stuff back later - thank you again for all this!