Fix JavaScript error on expanding MDX editor pane.

(Regression from #68 : f42e3f1e07f756192636ae6db4b085aa03815af5)
Fix wait message dialog position.
Fix Arquillian test failures.

- Fix invalid reference to removed Logback configuration file.
- Inject MyFaces configuration listener for testing.
- Fix test failure due to added scenario button.
Project home page overhaul.

- Switch to Maven Reflow skin.
- Use Markdown format whenever is possible.