partial 'latest sightings' in continents and country

create mode 100644 app/views/common/_latest_sightings.html.erb
 rewrite app/views/sightings/africa.html.erb 
 rewrite app/views/sightings/asia.html.erb 
 rewrite app/views/sightings/europe.html.erb 
 rewrite app/views/sightings/northamerica.html.erb 
 rewrite app/views/sightings/oceania.html.erb 
 rewrite app/views/sightings/southamerica.html.erb 
 rewrite app/views/sightings/country.html.erb