New Ember app setup

app.scss

// app/styles/app.scss
@import 'bootstrap';

blanket-options.js

// tests/blanket-options.js
blanket.options({
  loaderExclusions: [
    'initializers/app-version',
    'initializers/export-application-global',
    'config/environment'
]
});

Brocfile.js

var Funnel = require('broccoli-funnel');

app.import('bower_components/bootstrap-sass-official/assets/javascripts/bootstrap.js');
var bootstrapAssets = new Funnel('bower_components/bootstrap-sass-official/assets/fonts/bootstrap', {
  srcDir: '/',
  files: ['**/*'],
  destDir: '/fonts/bootstrap'
});

module.exports = app.toTree(bootstrapAssets);

environment.js

// config/environment.js
module.exports = function(environment) {
  var ENV = {
    sassOptions: {
      includePaths: [
        'bower_components/bootstrap-sass-official/assets/stylesheets'
      ]
    }
  }
};

gistfile1.txt

npm cache clear && bower cache clean && rm -rf node_modules bower_components && npm install && bower install

ember new my-app
npm uninstall ember-cli
npm link ember-cli

ember install:addon ember-cli-sass
mv app/styles/app.css app/styles/app.scss
ember install:bower bootstrap-sass-official

# Needed to include the Bootstrap files in the build
npm install --save-dev broccoli-funnel

ember install:addon ember-cli-blanket
ember install:addon ember-cli-pretender