[Autoflow] Bring in example taxonomy

Bring in example taxonomy and gitignore changes from
topic branch for WTD-614 into open-source-friendly
branch, in preparation to merge.

example/taxonomy/bundle.json

@@ -0,0 +1,29 @@
+{
+    "name": "Example taxonomy",
+    "description": "Example illustrating the addition of a static top-level hierarchy",
+    "extensions": {
+        "roots": [
+            {
+                "id": "exampleTaxonomy",
+                "model": {
+                    "type": "folder",
+                    "name": "Stub Subsystems",
+                    "composition": [
+                        "examplePacket0",
+                        "examplePacket1",
+                        "examplePacket2"
+                    ]
+                }
+            }
+        ],
+        "components": [
+            {
+                "provides": "modelService",
+                "type": "provider",
+                "implementation": "ExampleTaxonomyModelProvider.js",
+                "depends": [ "$q" ]
+            }
+        ]
+
+    }
+}