title: Don't clone git repository via composer
body: <p>I am trying composer from packagist.org and a git repository for managing versions of my library. When I required my library, composer cloned the repository to vendor folder, but I need only download files. Here's my composer.json:</p>
  
  <pre><code>{
      "name": "vend/xxxxxx",
      "description": "SDK for quick creation of client integration",
      "keywords": [
          "xxxxxxx",
          "sdk"
      ],
      "homepage": "xxxxxxxxxx",
      "type": "library",
      "license": "MIT",
      "autoload": {
          "psr-0": {
              "DDelivery": "application/classes"
          }
      },
      "extra": {
          "branch-alias": {
              "dev-master": "2.0.*@dev"
          }
      }
  }
  </code></pre>
  
  <p>and composer.json 2:</p>
  
  <pre><code>{
      "require": {
          "vend/xxxxxx": "2.0.*@dev"
      }
  }
  </code></pre>
  
  <p>What am I missing from my composer.json? How can I manage my versions through git and packagist.org? How do other vendors manage their frameworks?</p>