config.xml for iOS 7.1

[jlafitte]

305a466 added support for a number of new iOS icons, but they are not properly referenced in the config.xml file. I'm using the url below as a guideline and I don't know where the 29px 40px, 50px, 58px, 80px, 100px icons are used.

https://developer.apple.com/library/ios/documentation/userexperience/conceptual/mobilehig/IconMatrix.html

[tonijn]

I have made a pull request that will cover up to iOS9 and iPad Pro