Get Google CDN library name attribute from its path

All of the other CDNs supported by the API seem to do it this way, and it certainly makes it easier to build a URL from a result.

`/v1/google/libraries?fields=name,description&limit=3` before:

    [
      {
        "name": "AngularJS"
      }, {
        "name": "Dojo"
      }, {
        "name": "Ext Core"
      }
    ]

The same request, after:

    [
      {
        "name": "angularjs",
        "description": "AngularJS"
      }, {
        "name": "dojo",
        "description": "Dojo"
      }, {
        "name": "ext-core",
        "description": "Ext Core"
      }
    ]