New improvements

For server part:
Add comments
use Logfile instead of writing to console
use AWK language instead of other tools
Add Distro name and disk usage to SysInfo
add Clients IP, MAC and NAME to sysClients

For android part:
add comments
change deprecated tablayout with actionbar and fragments
add dropdown menu
add refresh and close button on actionbar
add AsyncTask tasks for background operation like login and refresh

and more.....