remove calls to warnings module, use log module instead
remove calls to warnings module, use log module instead

pombredanne/stdeb,astraw/stdeb,pombredanne/stdeb,LeMeteore/stdeb,LeMeteore/stdeb,benthomasson/stdeb,astraw/stdeb,pombredanne/stdeb,benthomasson/stdeb,sathieu/stdeb,sathieu/stdeb,astraw/stdeb,benthomasson/stdeb,sathieu/stdeb,LeMeteore/stdeb