Support WEP, Ad-hoc and SSID which includes "<>&

[NicolePP]

1. Support to set the cipher as WEP;
2. Support to set the key index as 1, 2, 3 or 4 when the cipher is WEP;
3. Support to set SSID with blanks at the beginning and end;
4. Support SSID or key which includes "<>&
5. Add a method network_profile_name_list() in class iface.Interface;
6. Add a method interface() in class wifi.PyWiFi which returns an Interface object according to GUID string;
7. Support Ad-hoc profile.