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Summary:
For the current project I am working on I needed to add a boolean option (`shadowHidden`) to remove the 1px hairline shadow from the NavigationIOS component:
`<NavigatorIOS shadowHidden={true} initialRoute={...} />`
By default, or with `shadowHidden={false}` it looks like this:

Setting the shadow hidden with `shadowHidden={true}` looks like this:

The code it uses to do the actual hiding is... a bit of a hack (*I* think), but it's the only way currently to do it, and is the way they do it in the iPhone calendar app: iterating through the subviews and removing the shadow image.
This removes the shadow *and* keeps the translucent blurry effect with a ScrollView (see this [SO discussion](http://stackoverflow.com/questions/18160173/how-to-remove-uinavigationbar-inner
Closes https://github.com/facebook/react-native/pull/1615
Github Author: Mr Speaker <mrspeaker@gmail.com>