Additionally added some license headers and @author tags.

fixes #17

added beginnings of a generic DiscoveryClient interface;

Eureka server is itself a eureka client when discovering eureka peers (it gets DiscoverClient from DiscoveryManager).  Make sure DiscoveryManager is initialzed regardless of if the client or server config is invoked first.

fixes gh-18

Add support for Ribbon loadbalancing in RestTemplate via an HttpRequestInterceptor that when supplied a uri such as http://myservice/my/endpoint (where myservice is a service as defined in a service registry, such as Eureka), it replaces 'myservice' with the actual host and port as returned from the configured ribbon loadbalancer.

closes gh-12

Without extracting to autoconfig the @ConditionalOnMissingBean won't
always work because it is dependent on the order of the configuration
classes being processed (and autoconfig always somes last).

Because we were using Lifecycle to kick off the eureka registration the
local server port wasn't available yet. The change is to use an
ApplicationListener and listen for the event that contains the container
with its port instead.

Fixes gh-15