gem install icomoon_as_well

icomoon_as_well /path/to/icomoon.zip /path/to/your_project [OPTIONS]

  --rails                Put all files into a rails project (app/assets/stylesheets, and app/assets/fonts) 

If you use Rails, be sure you had added

Rails.application.config.assets.paths << "fonts"

into config/initializers/assets.rb to add a fonts with asset pipeline

The gem is available as open source under the terms of the MIT License.