Reference links
http://hostap.epitest.fi/wpa_supplicant/devel/
http://rtl8192cu.googlecode.com/hg-history/bdd3a2265bdd6a92f24cef3d52fa594b2844c9c1/document/wpa_cli_with_wpa_supplicant.pdf
http://ubuntuforums.org/showthread.php?t=263136
http://linux.die.net/man/5/wpa_supplicant.conf
https://wiki.archlinux.org/index.php/WPA_supplicant
