title: compiling less file using angular2 cli
body: <p>I've following settings inside angular-cli-build </p>
  
  <pre><code>Angular2App(defaults,{
   lessCompiler: {
       includePaths: [
         'src/app'
        ],
     }
  })
  </code></pre>
  
  <p>I'have two test less files in <code>src</code> directory.</p>
  
  <p>test1.less</p>
  
  <pre><code>//some code
  </code></pre>
  
  <p>test2.less</p>
  
  <pre><code>@import "test1.less";
  </code></pre>
  
  <p>when I <code>ng build</code> the project it throws an error</p>
  
  <pre><code>Build failed.
  File: input (1)
  The Broccoli Plugin: [LESSPlugin] failed with:
  undefined
  </code></pre>
  
  <p>I've tried <a href="https://github.com/angular/angular-cli/issues/873" rel="noreferrer">issue 873</a> temporary solution. The error gone.but could not find any compiled css files.
  please help. how you compile customized bootstrap less files in angular2 project which is built by angular-cli. </p>
  
  <p>how could I extend the bootstrap's less file's(stayed inside node_modules) with my custom lesses </p>