Converted FeedbackDemo app icons and launch images to Asset Catalogs.
Fixes Xcode warning where pre-7.1 devices cannot use xib-based launch images.
Set Launch Image for iOS 7,8 Retina 4 in Asset Catalog.
Fixes Xcode warning: "An iPhone Retina (4-inch) launch image for iOS 7.0 and later is required."
Update to v1.6.0
Merge branch 'master' into seattleDesign