Fix whitespace collapse in Chrome 25
Fix whitespace collapse in Chrome 25

Work around a recent change to Chrome that results in the previous
whitespace collapsing technique failing. Chrome doesn't need the
`word-spacing` hack but it has started to respect the property, and
this is causing grid cells to overlap.

However, Opera for Windows does need the `word-spacing` hack. The
fix is to use an Opera prefixed pseudo-class in a new selector block for
the `word-spacing` declaration. All other supported browsers will ignore
the rule. Only the Android 4.2 browser still seems to have problems
fully collapsing the whitespace.

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