Unify example accessory

Using Lockitron for first new-style example accessory, since it has a
very simple and public API.

example-providers/homebridge-lockitron/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "homebridge-lockitron",
+  "version": "0.0.0",
+  "description": "Lockitron Support for HomeBridge",
+  "license": "ISC",
+  "engines": {
+    "homebridge": ">=0.0.0"
+  },
+  "keywords": [
+    "homebridge-provider"
+  ]
+}