changed the way to select the interface

now it behaves like this:

```*****************************************************************
*                      WEPCrackeator 2011                       *
*****************************************************************
*    Siempre es buen momento para crackear un router WEP  :D    *
*****************************************************************
*                       Made by SeRGiNaToR                      *
*                    28-01-2011 - versión 1.0                   *
*****************************************************************

			Setting the environment
*** Removing mon0 if exists ***
*** Visible interfaces are: ***
wlan1		RTL8187 	rtl8187 - [phy2]
wlan0		Atheros 	ath9k - [phy0]
*** Please input the interface you want to use: ***
wlan1
*** Got it! The interface is wlan1 ***
*** wlan1 in monitor mode ***
*** Spoofing wlan1 and mon0 ***```