New code without using WART:
Install yowsup2

pip install yowsup2

yowsup-cli registration --mcc <mobile country code> --mnc <mobile network code> --phone <phone number including the country code, but without a + or 00> --cc <country code> -r sms

You should receive a code per SMS on your phone.

yowsup-cli registration --mcc <mobile country code> --mnc <mobile network code> --phone <phone number including the country code, but without a + or 00> --cc <country code> -R <the code you got>

You should get a new password (and some more informations on your PC)
Then change the config file /home/user/.config/cepiperez/whatsup.conf with the new password.

Enjoy !
Ps. I tested this method with Ubuntu 14.04.
mcc and mnc: http://www.wikiwand.com/en/Mobile_country_code
country code: www.ipipi.com/help/telephone-country-codes.htm