[w3c/manifest] Ability to claim web app (#476)

CHALLENGE: How does a web app author "claim" their web app.

DISCUSSION: 
Having web app authors include a ton of developer metadata in the web app manifest could make the file bloated.  
It would also be non-optimal to force web app authors to include email addresses or other PII in the web app manifest.

Looking to how search engines enable website authors to claim their sites seems informative:
* Upload a file
* Include a meta tag with opaque content:

`<meta name="google-site-verification" content="PxOAmyFt5AWoMLGXou0nol_x3xPYuYjdclDlFTj2Chg" />`

Allowing the author to include one or more opaque identifier strings in the W3C Web App Manifest seems to be the most straightforward solution.  

PROPOSAL: Add a description of this scenario to the Extensibility section of the spec http://www.w3.org/TR/appmanifest/#extensibility 

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https://github.com/w3c/manifest/issues/476