Cached iOS LaunchStoryboard image displayed before updated LaunchStoryboard image.

If an old launch storyboard image is cached on the device, it is displayed on launch and then fades to the current LaunchStoryboard image.

Steps:
1. Deploy to iOS with LaunchStoryboard set to image1.
2. Change LaunchStoryboard to image2 and redeploy.
3. See image1, followed by a quick fade to image2.

Resetting the device will clear this cache, but we cannot expect this from users.

I have found that removing the LaunchStoryboard Image View form CDVLaunchScreen.storyboard will prevent this image from being cached, and it will still display after the initial view transition.

Also, a background color can be set on the initial view which will not be cached. It may be useful to be able to set the backgroundColor of the storyboard via config.xml.