Check if the status field is a String and don't propagate any Exception
from the StatusUpdater, so that the application don't fail like in #120

Streamline the Hazelcast support with boot 1.3 and support storing events in hazelcast

closes #113

Due to our use of @Conditionals on our @Configuration-classes the import must be deferred, so that the classes are processed after all other @Configuration-classes

remove logfileEndpoint
rename logback.xml to logback-spring.xml in samples

fixes #98

 * Use @EventListener instead of ApplicationListener-interface
 * Don't inherit ClientApplicationEvent from ApplicationEvent - so JournaledEvent isn't needed anymore
 * added eclipse formatter rules
 * reformatted all files

Remove unecessary dependencies

fixes #105

The mail notification is enabled if a mailSender is present specified via spring.mail.* properties.
On default the mail is sent to root@localhost and the chages from UNKNOWN to UP are ignored.

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.

The health-check is made at a fixed interval (default: 10s) for all expired status-information (default-lifetime: 30s).
The application health-endpoint must either respond with a JSON-Body having a status-field or with an empty body and all 2xx-http-responses are interpreted as UP and every other status as DOWN.

fixes #61

To enable, you just have to add a DiscoveryClient to your Spring Boot Admin Server.
Also did some code polish.
Closes #44

Fixes #27

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

* 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.