Install bower

Install bower using npm

npm install -g bower

.bowerrc
Create .bowerrc file at root of your rails app to set the path to your component.

touch .bowerrc
{
  "directory": "vendor/assets/components"
}

.gitignore

bower_components

Init bower
File bower.json will be create depend on your answers.

bower init

It should looks like:

{
  "name": "project name",
  "ignore": [
    "**/.*",
    "node_modules",
    "bower_components",
    "test",
    "tests"
  ],
  "dependencies": {
    "bootstrap-fileinput": "latest"     # Add libraries that you need here.
  },
  "private": true
}

Find more library at https://bower.io/search
 
Install your libraries

bower install

config/application.rb

config.assets.paths << Rails.root.join('vendor', 'assets', 'components')

Don't forget require .js and .css files in application.css and application.js