Don't use a hardcoded core number.

Instead use number_of_cores / 2.
To be TO BE SUASHED
Second attempt.
Update README.md.
Merge pull request #433 from XhmikosR/readme

Update README.md.
Merge pull request #432 from XhmikosR/workers

Don't use a hardcoded core number.
Tweak markup.

* Add a few ARIA related stuff
* Pass `?theme=xx` when clicking on `navbar-brand`
* Remove redundant `col-xx-x`
* Add missing `container-fluid` in `navbar`
* Fix `toggleCode` to work with Font Awesome 4.x
* Lots of other markup tweaks
Merge pull request #434 from XhmikosR/markup

Tweak markup.
extras_popular.jade: Add jQuery Tablesorter plugin.

This allows us to sort the table.

TODO: Get rid of the empty `th`.
Disable sorting for the empty `th`.