Change the scope for spring-boot-starter-test to test.

Altered JSON invocation of JMX methods to support the following change implemented in Jolokia Release 0.91 (http://www.jolokia.org/changes-report.html):

Fixed issue with overloaded methods where one variant takes no arguments. This no-arg variant can be specified with the signature "()" after the operation name.

Separate the UI from the server

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

server.context-path not used when application registers itself #32
Typo in About #31

closes #25 #28

Fixes #27

Filed https://github.com/spring-projects/spring-boot/issues/1987 in order to configure it properly in the future.

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