Added a simple event journal, jorunaling all ClientApplicationEvents using a simple, non-persistent store. So all information is lost after restart. Added corresponding view to UI.

Use tabs for idents, small lint fixes

using Gulp & Browserify
with a little help from https://blog.codecentric.de/en/2014/08/angularjs-browserify

* registry-key is derived from URL
* option to specify a management-URL and other various config options see spring-boot-starter-admin-client/README.md
* less chatty registration
* some more test cases
* show application URL in overview and headline
* show application info in overview
* set HTTP-Codes in RegistryController

fixes #13
fixes #16
closes #17
closes #18

I didn't add the key-value-properties to the Application. Since it was somehow redundant to the /info-endpoint.

* Removed a bunch of useless CSS
* Prepared DI-usage for minification

Reading, writing attribute and operation execution supported.

Fixes gh-8