Run CI only against latest stable Node and 0.12
Run CI only against latest stable Node and 0.12

Mira-M/geofire-js,Mira-M/geofire-js,stackOverMind/geofire-js,firebase/geofire-js,juzhen21510/geofire-js,juzhen21510/geofire-js,duncanchen/geofire-js,firebase/geofire-js,duncanchen/geofire-js,firebase/geofire-js,stackOverMind/geofire-js