Package.json trivial issues

It would be useful to add `bugs` too, to let people know if the preferred tracker is the product related one or issues here in github, e.g.:
```
$ git diff
diff --git a/package.json b/package.json
index 671d802..6c6f4e9 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
     "type": "git",
     "url": "https://github.com/camunda/camunda-bpmn.js"
   },
+  "bugs": "https://app.camunda.com/jira/browse/CAM/component/11950",
   "devDependencies": {
     "grunt": "~0.4.1",
     "grunt-contrib-requirejs" : "~0.4.0",

```