Per request, noted that project templates use support library
objects, and explained that (e.g.) this means they can provide
material design features on older devices.
See first comment for doc stage locaton.
bug: 25973575
Change-Id: I9e21d4257583c03bbba5cfa309cbe6fe1f91e600
List of issues from https://code.google.com/p/android/issues that are fixed by this CL: 183476,183249,183248,183241,183222,183142,183093,183329,182385,182311,182193,182019,73149,181589,179740,179384,178322,178189,178086,178020,177169,176312,175138,172322,172030,171820,170647,167288,163574,161580,161041,159199,151347,144290,136137,132505
Change-Id: I2e96f7444048abd2f666c75bd6ab9640019afb75
