old_contents: from flask.ext.assets import Bundle
  
  app_css = Bundle(
      'app.scss',
      filters='scss',
      output='styles/app.css'
  )
  
  app_js = Bundle(
      'app.js',
      filters='jsmin',
      output='scripts/app.js'
  )
  
  vendor_css = Bundle(
      'vendor/semantic.min.css',
      output='styles/vendor.css'
  )
  
  vendor_js = Bundle(
      'vendor/jquery.min.js',
      'vendor/semantic.min.js',
      'vendor/tablesort.min.js',
      filters='jsmin',
      output='scripts/vendor.js'
  )
  
new_contents: from flask.ext.assets import Bundle
  
  app_css = Bundle(
      '*.scss',
      filters='scss',
      output='styles/app.css'
  )
  
  app_js = Bundle(
      'app.js',
      filters='jsmin',
      output='scripts/app.js'
  )
  
  vendor_css = Bundle(
      'vendor/semantic.min.css',
      output='styles/vendor.css'
  )
  
  vendor_js = Bundle(
      'vendor/jquery.min.js',
      'vendor/semantic.min.js',
      'vendor/tablesort.min.js',
      filters='jsmin',
      output='scripts/vendor.js'
  )
  
subject: Generalize scss bundle to track all scss files