Add "Joel Test" to /jobs "Work environment"

@moby86 suggested to add [Joel Test](http://www.joelonsoftware.com/articles/fog0000000043.html) results to the "Work environment" section on our jobs web page.
![image](https://f.cloud.github.com/assets/360800/1849637/294fffae-76b9-11e3-9b3f-fbaa4586b73f.png)

IMO we have "yes" for everything except the last one, which is "soon" ;)
@christopheschwyzer wdyt?