Adding geoip gem to gemfiles/Gemfile.mongoid-2.4.x.
Adding geoip gem to gemfiles/Gemfile.mongoid-2.4.x.

Required for ruby 1.8.7 and 1.9.2 builds on travis.

moofish32/geocoder,gogovan/geocoder-olleh,sideci-sample/sideci-sample-geocoder,alexreisner/geocoder,rayzeller/geocoder,ankane/geocoder,mdebo/geocoder,FanaHOVA/geocoder,3mundi/geocoder,rdlugosz/geocoder,tortuba/geocoder,TrangPham/geocoder,AndyDangerous/geocoder,jaigouk/geocoder-olleh,tiramizoo/geocoder,sr-education/geocoder,boone/geocoder,rios1993/geocoder,eugenehp/ruby-geocoder,GermanDZ/geocoder,epyatopal/geocoder,StudioMelipone/geocoder,davydovanton/geocoder,Devetzis/geocoder,donbobka/geocoder,jaigouk/geocoder-olleh,jgrciv/geocoder,ivanzotov/geocoder,brian-ewell/geocoder,mehlah/geocoder,crdunwel/geocoder,andreamazz/geocoder,gogovan/geocoder-olleh,sjaveed/geocoder,guavapass/geocoder,mveer99/geocoder,aceunreal/geocoder,malandrina/geocoder