Feature Compat: Duck Hunt

[cvan]

1. Create repo called duck-hunt in WebVRRocks GitHub org
2. git clone https://github.com/jsyang/aframe-experiment2.git old-duck-hunt
3. cd old-duck-hunt
4. Test this game, and copy the relevant portions to the duck-hunt repo
5. Upgrade A-Frame and dependencies, as needed
6. Enable GitHub Pages for master branch (from the Settings page of the duck-hunt repo)

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Relevant links:

• https://dl.airtable.com/4CwAPuKCRDOAo7Sicedj_duckhunt-aframe.mp4
• https://twitter.com/cvanw/status/791240066551062528
• https://twitter.com/cvanw/status/895023855248359424
• https://twitter.com/spacefishing/status/791087702691176448
• https://www.reddit.com/r/WebVR/comments/59gs5u/duckhunt_with_aframe_vr/

[cvan]

/cc @caseyyee feel free to grab this one