Re: [csswg-drafts] [css-grid] Stretching image grid items in both dimensions

Cover example:
```
  img { object-fit: cover; }
```
Contain example, margin/border/padding fitted to grid slot and image 
proportionally sized into it:
```
  img { object-fit: contain; }
```
Contain example, margin/border/padding fitted to proportionally 
scaled-down image:
```
  img { justify-self: center; align-self: center; min-width: 100%; 
min-height: 100%; box-sizing: border-box }
```
Contain example with future syntax, margin/border/padding fitted to 
proportionally scaled-down image:
```
  img { foo-self: center; max-size: fill; }
```

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