[WIP] Adding OS Name and OS Version in Host check and web pages
Added : Getting os name and version for Debian and Ubuntu

Todo : seek differences between Debian and Raspian, can be cool to display the Raspberry logo instead of debian logo on web pages :)
Some coding syntax fixes
Updated : Apple and Debian logos with transparent background
Applied review fixes
Merge pull request #13 from miniche/host-infos

Added os name and os version