Be responsive

Hi Joel,
Your GitHub widget is very nice (I use it on my homepage: http://www.ateliers-pierrot.fr/#content-tabs-hash:packages-review). Thank you for this work!

But, my homepage above is all responsive (thanx to Bootstrap) except your widgets. So I work a little on it and propose you here three new stuffs for your repository:

- first, I added some titles to links where it seems relevant,
- then, I removes the (ugly) ".DS_Store" and put a ".gitignore" in the repo to not put any OS file under version-control,
- finally, the real part: I updated your CSS rules for a responsive rendering, with some floating rules and a media-query

![responsive-github-widget](https://f.cloud.github.com/assets/1021199/1556907/fddd5388-4ef1-11e3-9592-330e1b631209.png)

I directly worked on the `jquery.githubRepoWidget.js` file and didn't update the Less one. I merged my modifications in the `jquery.githubRepoWidget.min.js` and the Twig template, that are up-to-date. Finally, I tested all this under Firefox, Chrome and Safari.

Do not hesitate if you have any question ...

Regards,
P.