* Add MarkdownSimple component.
* Replace Context use of notifier with toastNotifications.
* Replace field.js use of notifier with toastNotifications.
* Replace State use of notifier with toastNotifications.
* Replace reporting use of notifier with toastNotifications.
* Convert Logstash to use toastNotifications.
* Convert Security to use toastNotifications.
This PR is a pretty small change to the Reporting job complete notification service. It converts the actual code to a simple object, instead of a class that needs to be instantiated. This makes the notification service a singleton, and also exports it so it can be used in non-Angular applications.
- Converts `reportingJobCompletionNotifications` factory to a singleton
- Exports the underlying jobCompletionNotifications
- Allow use in non-angular plugins
Example use:
```js
import { jobCompletionNotifications } from 'plugins/reporting/services/job_completion_notifications';
createReportingJob() // pseudo code function that returns a reporting job id
.then(jobId => jobCompletionNotifications.add(jobId));
```
