This allows you to protect your spring-boot-admin rest api.
Supporting basic auth on management-endpoints needs more work.

Rename ApplicationStore methods to spring-data-style

* Separate AppStore from AppRegistry
* Allow Id generation to be altered
* Remove logic from Application; Move id genretation into AppRegistry
* Make AppStore threadSafe

Redesigned registration.

* 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.

Ui enhancements

* fixed health display when application is DOWN

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

Reading, writing attribute and operation execution supported.

Register application with correct spring-boot management path