Using harmony device

Still need to look up devices specific to hubs (In the case of the same device on multiple hubs)

src/Models/HarmonyDevice.ts

@@ -26,6 +26,10 @@ export class HarmonyDevice {
     public id: string;
     public name: string;
 
+    public get on(): boolean {
+        return this._on;
+    }
+
     //Define device methods
     public supportsCommand(commandName: string): boolean {
         let command = this._commands[commandName];