google-api-php-clientの為のcomposerの設定。もちろんautoloadも対応してるお！

composer.json

{
  "autoload": {
    "psr-0": {
      "": "src/"
    },
    "classmap": ["vendor/google/google-api-php-client/src"]
  },
  "repositories": [
    {
      "type": "package",
      "package": {
        "name": "google-api-php-client",
        "version": "0.6.2",
        "dist": {
          "url": "http://google-api-php-client.googlecode.com/files/google-api-php-client-0.6.2.tar.gz",
          "type": "tar"
        }
      }
    }
  ],
  "require": {
    "php": ">=5.3.3",
    "google/google-api-php-client": "0.6.2"
  }
}