Add a tsconfig to the Thumbnailer example

examples/thumbnailer/thumb.ts

@@ -5,6 +5,7 @@ export class Thumbnailer extends mu.Stack {
     private dest: mu.Bucket;   // the destination to store thumbnails in.
 
     constructor(source: mu.Bucket, dest: mu.Bucket) {
+        super();
         this.source = source;
         this.dest = dest;
         this.source.onObjectCreated(async (event) => {

examples/thumbnailer/tsconfig.json

@@ -0,0 +1,10 @@
+{
+    "compilerOptions": {
+        "target": "es6"
+    },
+    "files": [
+        "index.ts",
+        "thumb.ts"
+    ]
+}
+