fix school profile url for share widgets
fix school profile url for share widgets

use underscore templating to get the right url

for #32
devgateway/map-kibera-schools,mapkibera/map-kibera-schools,pmk25/map-kibera-schools,pmk25/map-kibera-schools,devgateway/map-kibera-schools,mapkibera/map-kibera-schools,devgateway/map-kibera-schools,pmk25/map-kibera-schools,mapkibera/map-kibera-schools,pmk25/map-kibera-schools,mapkibera/map-kibera-schools,devgateway/map-kibera-schools