added pdf of presentation.

To get it just delete the addthisbar from the html file

```
<!-- Social buttons -->
<div class="addthis_toolbox addthis_floating_style addthis_32x32_style" style="left:20px;top:20px;">
<a class="addthis_button_twitter"></a>
<a class="addthis_button_google_plusone_share"></a>
<a class="addthis_button_linkedin"></a>
<a class="addthis_button_facebook"></a>
<a class="addthis_button_more"></a>
</div>
<!-- End of social buttons -->
```

and follow the reveal.js intructions to get the pdf...

Sorry for the problem with the addthisbar...

Cheers.

Damián.