title: grunt-contrib-copy copy directory into another without root dir
body: <p>I am trying to copy a structure like so:</p>
  
  <pre><code>src
  |-a
  |-b
  |-c
  ||-ca
  ||-cb
  dest
  |-a
  |-b
  |-c
  ||-ca
  ||-cb
  </code></pre>
  
  <p>However, I appear to not be able to accomplish this without the src directory itself appearing in the dest directory. ie</p>
  
  <pre><code>src
  |-a
  |-b
  |-c
  ||-ca
  ||-cb
  dest
  |src
  ||-a
  ||-b
  ||-c
  |||-ca
  |||-cb
  </code></pre>
  
  <p>My copy config is set up like so:</p>
  
  <pre><code>files: [
      {src: [targetDirectory+"index.html"], dest: buildDirectory, expand: true},
      {src: [targetDirectory+"*.png"], dest: buildDirectory, expand: true},
      {src: [targetDirectory+minJSDestination], dest: buildDirectory, expand: true},
      {src: [targetDirectory+minCSSDestination], dest: buildDirectory, expand: true},
      {src: [targetDirectory+"assets/fonts/**.*"], dest: buildDirectory, expand: true},
      {src: [targetDirectory+"assets/images/**.*"], dest: buildDirectory, expand: true},
      {src: [targetDirectory+"assets/partials/**.*"], dest: buildDirectory, expand: true},
      {src: [targetDirectory+"src/*.js"], dest: buildDirectory, expand: true}
  ]
  </code></pre>
  
  <p>I've tried the flatten option which removes the 'src' directory from dest, but it also removes the other directories and puts each of the files at the root level of dest.</p>
  
  <p>I've tried setting 'cwd' to the destination and source directories but this just seems to prevent the copy all together.</p>
  
  <p>I'm sure there must be an option which allows this but I'm yet to find it. Anyone have any ideas?</p>