Fire InstanceRegisterEvent after eureka registration, then components can listen for that event and safely access DiscoveryClient.

updated sidecar so the health and info urls go to sidecar, but homepage and non-secure-port go to local app

Conflicts:
	pom.xml
	spring-cloud-netflix-core/src/main/java/org/springframework/cloud/client/discovery/DiscoveryClient.java
	spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClient.java

This allows mappings to be at the root and not have to be prefixed.  It also allows mappings to fall through to other handler mappings.  Patterns are now Ant-style via AntPathMatcher.

fixes gh-72

update versions of netflix libs

fixes gh-68

fixes gh-67

Fixed formatting in docs.

fixes gh-45

If the prefix is set we also set configPath=<prefix> in the
instance metadata, so config clients can pick it up and add it
to the home page URL.

Fixes gh-64, fixes gh-65

Added LoadBalancerClient.reconstructURI to take an URI with the service as hostname and inject a real host and port.
Added tests for RibbonInterceptor and RibbonLoadBalancerClient.

fixes gh-37

The problem manifests itself as errors in the Eureka server
log (gh-47), but originates in the client because it is sending
requests to /eureka/apps/{NAME}/{ID} with the wrong ID. The
InstanceInfo has an ID that is derived (for preference) from
the EurekaInstanceConfig.dataCenterInfo, so that's the best
way to fix it.

See gh-63, Fixes gh-47

fixes gh-50

fixes gh-53

fixes gh-58

fixes gh-40

fixes gh-57

and how to use it. In particular you can't use it before the
ApplicationContext is past phase=0 of lifecycle startup.

Fixes gh-48

I didn't see a way to do this without dynamic rendering, so
now we have a freemarker dependency (not huge I guess).

Fixes gh-51

Fixes gh-52

Most browsers support <base href="..."> these days and there
was one already in statut.ftl (but not in navbar). Added a test
that asserts the css is loadable as well.

Fixes gh-55