Update project polymer to 0.5.1

libgrabber updated project polymer to 0.5.1.

@polymer

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "polymer",
    "repo": "polymer/polymer",
    "files": {
      "include": ["polymer.js", "polymer.js.map"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/polymer",
    "localVersions": ["0.2.2", "0.3.2", "0.3.3", "0.3.4", "0.3.5", "0.4.0", "0.4.1", "0.4.2", "0.5.0"],
    "remoteVersions": ["v0.0.20130711", "v0.0.20130801", "v0.0.20130808", "v0.0.20130815", "v0.0.20130816", "v0.0.20130829", "v0.0.20130905", "v0.0.20130912", "v0.0.20131003", "v0.0.20131010", "v0.0.20131025", "v0.0.20131107", "0.1.4", "0.2.0", "0.2.1", "0.2.2", "0.2.3", "0.2.4", "0.3.0", "0.3.1", "0.3.2", "0.3.3", "0.3.4", "0.3.5", "0.3.6", "0.4.0", "0.4.1", "0.4.2", "0.5.0", "0.5.1"],
    "branchVersions": []
  },
  "version": "0.5.1",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/polymer/0.5.1",
  "branch": "polymer/0.5.1"
}
```