In our iLounge Deal for today we’re offering The Full Stack iOS 9 School for only $39 — that’s 80% off the regular price. This self-paced course will teach you the basic principles of design and how to apply them to iOS apps, with 16 classes, 100 videos, and 30 hours of content that takes you through app building from concept to creation. Courses will take you through designing apps in Sketch 3, prototyping in Xcode, and building apps…