How to switch keyboards in Android Lollipop

One of the best things about Android is the way you can change core components and customize things to your liking. Keyboards are a big part of that, and there are certainly plenty of great ones to choose from in Google Play. The one thing you need to know before you can use any of them, is how to switch which keyboard is active. Long-time Android fans are used to the nagging notification in the status bar that helps you change keyboards, but things have changed a bit in Lollipop. On the Nexus 6...