Sets deployment target to 7.0. Refs gradha/theranking-ios-candidates#16.
Adds launch image for iPhone 4". Refs gradha/theranking-ios-candidates#16.
Patches xibs to avoid deployment target warnings. Refs gradha/theranking-ios-candidates#16.

See http://stackoverflow.com/a/25453685/172690.
Merge branch 'feature/t16_deploy' into develop