Re: [w3c/manifest] Icon shapes and masking (#555)

Some examples of Adaptive icons, and a small guideline to display the proportions needed to be inside of the Android cropping masks.

![sample-guidelines](https://cloud.githubusercontent.com/assets/1953388/24296619/b5480120-1097-11e7-8663-6a7e537b7329.png)

Single images:
![android-circle-example-webnfc](https://cloud.githubusercontent.com/assets/1953388/24296634/c5e2a1a2-1097-11e7-89fd-03560f4407c4.png)

![android-round-example-webnfc](https://cloud.githubusercontent.com/assets/1953388/24296635/c8eb92d2-1097-11e7-8dd6-bba22265eb00.png)

![android-square-example-webnfc](https://cloud.githubusercontent.com/assets/1953388/24296638/cb5c0862-1097-11e7-81f8-13c009fc40c1.png)

![example-grid-webnfc](https://cloud.githubusercontent.com/assets/1953388/24296641/d091a7e2-1097-11e7-9c69-8dbc408ef753.png)
The grid

![animation](https://cloud.githubusercontent.com/assets/1953388/24297108/6ee6cc3c-1099-11e7-8f2d-d841e8ef86a5.gif)
Animated gif

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