Don't refer to fonts.googleapis.com for the fonts so that using the ui behind a
corporate proxy isn't such a pain anymore.

fixes #213

Checks the DiscoveryClient's services on each heartbeat and removes all
services, which are no longer registered.

fixes #214

fixes #205

Use the metadata for health-/managament-url in the default service conversion.
This allows custom health- and management-path per application.

fixes #205

fixes #205

... since we use webpack.

Adds an application view that displays a list of
Liquibase migrations as retrieved from the /liquibase Actuator
endpoint. The module is conditional on this endpoint being
available.

otherwise it gets mixed up whith the standard html title attribute

Adds an application view that displays a table of
Flyway migrations as retrieved from the /flyway Actuator
endpoint. The module is conditional on this endpoint being
available.

Fixes gh-206

fixes #209

closes #201

fixes #202

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.

This adds a new FilteringNotifier which can use filters to suppres certain
events from being notified of. Two filter implementation are provided, one
filtering by name and one by id. Additional when a FilteringNotifier bean is
present, the autoconfiguration creates a REST-controller to add and remove
filters at runtime.