Implement the closure js compiler filter
Implement the closure js compiler filter

Uses the google closure http api, which is a little annoying, but adds
no dependencies. Otherwise nodejs or something would be required to
build.

devgateway/map-kibera-schools,pmk25/map-kibera-schools,uniphil/kibera-school-project,pmk25/map-kibera-schools,uniphil/kibera-school-project,devgateway/map-kibera-schools,devgateway/map-kibera-schools,mapkibera/map-kibera-schools,pmk25/map-kibera-schools,uniphil/kibera-school-project,mapkibera/map-kibera-schools,mapkibera/map-kibera-schools,mapkibera/map-kibera-schools,devgateway/map-kibera-schools,pmk25/map-kibera-schools