Re: [manifest] Define identity of a web app (closes #272) (#297)

Changed my mind about this, actually. The identifier has to be the start URL. That is because N apps can share the same manifest URL (given that they can be retrieved cross-origin). For example:

```HTML
<link rel=manifest href="stuff/generic_manifest.php"> 
```

Or even where, say, the HTTP `Referer` header could be used to generate the manifest: 

```HTML
<link rel=manifest href="https://fast.cdn.com/manifest"> 
```
So, I think the start URL is actually what we want to use as the identifier. 

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