Added io_surfer.py into cookbook
Added io_surfer.py into cookbook

I'll change the url part when `fetch_bouguer_alps_egm()` will done

eusoubrasileiro/fatiando,drandykass/fatiando,cmeessen/fatiando,rafaelmds/fatiando,cmeessen/fatiando,mtb-za/fatiando,fatiando/fatiando,eusoubrasileiro/fatiando,santis19/fatiando,mtb-za/fatiando,drandykass/fatiando,victortxa/fatiando,victortxa/fatiando,fatiando/fatiando,rafaelmds/fatiando,santis19/fatiando,eusoubrasileiro/fatiando_seismic,eusoubrasileiro/fatiando_seismic,eusoubrasileiro/fatiando