Installing third party dependencies in ember v1

I am new to ember.js and am running ember v1 on rails. My goal is to install a third party plugin using npm or bower. The plugin is the leaflet-routing-machine. This question has already been addressed here but when I run

npm install ember-browserify --save-dev

nothing is added to the gemfile.

What would be the equivalent of gem install for a third party plugin in Ember v1?

gemfile.lock:

ember-data-source (1.0.0.beta.11)
  ember-source
ember-rails (0.15.0)
  active_model_serializers
  barber (>= 0.4.1)
  ember-data-source (>= 1.0.0.beta.5)
  ember-source (>= 1.1.0)
  execjs (>= 1.2)
  handlebars-source (> 1.0.0)
  jquery-rails (>= 1.0.17)
  railties (>= 3.1)
ember-source (1.8.1)
  handlebars-source (~> 1.0)