set up firebase (see message)

List core firebase.js in "jade/partials/scripts.jade" so it appears in "build/index.html" on a Jade build.  Install core Firebase file "build/js/libs/". Install "grunt-bowercopy" via npm and list it "package.json". Create a grunt task that copies firebase.js over from "bower_components" to "build/js/libs". Make this task run via gulp.