Buzzfeed has posted an article in which an explanation is given on how to hide stock (or any) apps on your device running iOS 9. I tried it out myself and it actually works. Caveat is that if your phone restarts then the apps come back, but still a neat bug.
http://www.buzzfeed.com/nicolenguyen/piece-of-crapp-store#.fmebJvjwe
http://www.buzzfeed.com/nicolenguyen/piece-of-crapp-store#.fmebJvjwe