With this commit objects are passed now correctly to jolokia. The
object's needs to be written in json, which is validated for well-
formedness.
From now on the attributes are read autmatically when the bean gets
selected and I fixed that errors weren't displayed.

fixes #301

With this commit the icons from FontAwesome are used. To achive this the
webpack css-loader is used and the location for the module.css has slightly
changed.
Also I removed the ugly sidebar (what a short life) and added a slim navbar at
the top for the detail views.