Fix flex-grid-column with nowrap child

On the last version of chrome, the child of a `flex-grid-column(null)`
with
```css
white-space: nowrap;
overflow: hidden;
```
doesn't have a limited size, and the full content is showed in one line
exceeding the row.

`min-width: 0;` fix this problem, probably by remembering to chrome to
evaluate the column width with a `0px` content width (it's what `flex:
1 1 0px` should do).
https://stackoverflow.com/questions/34934586/white-space-nowrap-and-flex
box-did-not-work-in-chrome