text: var autoprefixer = require('autoprefixer-core');
  
  module.exports = function (app) {
    var processor;
  
    // Default conf.
    app.conf.add({
      assets: {
        prefix: {
          browsers: ['> 1%', 'IE >= 9'],
          cascade: false
        }
      }
    });
  
    // Create processor.
    processor = autoprefixer(app.conf.get('assets:prefix'));
  
    // Prefix the given css.
    return function prefix (css) {
      return processor.process(css).css;
    };
  };
  