[WIP] Added os name and os version

Getting os name and os version in Collectors and display it on web pages, like this : 


![Capture d e cran 2013-01-06 a 22 56 54](https://f.cloud.github.com/assets/1638158/46342/8f0880f0-584c-11e2-8e86-55d7b113ad27.png)