Corrected inconsistencies in 3-space indentation.
Pulled image attribute normalization into a separate function.
Added support for splash screens by platform.
Added support for the top-level icon element from which Cordova generates platform-appropriate icons.
Removed "px" suffix from numbers in the platform icons test.
Fixed features example in Readme to show an array of objects rather than a single object.
Added support for preferences inside platforms.
Updated Readme to reflect new icon and platforms options.