Support CSS text-wrap: balance

[howwellapp]

Support CSS text-wrap: balance, which makes headlines and titles look nicer (more info).

Note: AFAIK there are no text balancing libraries in react-native. I have to balance by hand.

[liamjones]

It looks like Text already supports this on Android via the textBreakStrategy property.

On iOS Text has the lineBreakStrategyIOS property but I'm not sure if that's going to do what you want - I'd suggest trying pushOut or standard.