Implemented resources sorting.

I used "tablesorter", a jquery plugin that handles tables. Look at http://mottie.github.io/tablesorter/docs/index.html for more info.
I will include this library in the next commit. In this way this commit will remain clean.
Added "tablesorter" library.

Look at http://mottie.github.io/tablesorter/docs/index.html for more info.