Now uses spring-cloud-context NamedContextFactory.

see https://github.com/spring-cloud/spring-cloud-commons/issues/69

We need to use BeanFactoryUtils to search the context hierarchy
for custom instances.

Fixes gh-733

Add Servo metric poller and @EnableAtlas test

Update docs to indicate the need for spring-cloud-starter-atlas

Minor improvements to error messages for netflix.atlas.uri problems

* pull699:
  Add Zuul Proxy regex serviceId to route mapping

fixes gh-693

* gh-691:
  Enable configuration of the way HttpClient handles redirects

RibbonLoadBalancingHttpClient being IClientConfigAware, it is now
initialized within initWithNiwsConfig. The values of the config keys
FollowRedirects, ConnectTimeout and ReadTimeout are now respected.

Fixes gh-691

* gh-583:
  Removing multiple successive slashes

Eliminates zuul URISyntaxException if route has trailing slash.

fixes gh-583

* pull704:
  Explicitly set target to feign client name.

fixes gh-703

fixes gh-717

Servo, Spectator, and Atlas docs

redefine isSuccess to 2xx status code series.

fixes gh-687

Allows POST with a @RequestBody

Fixes gh-689

fixes gh-685

Rather than pulling them from the generic context.

fixes gh-683

Add isDebugEnabled() for logging operations

If the management.port is explicitly set to something other than the
server.port, we can use it to set the status page and health URL
default values. (They can still be overridden by config properties.)

If management.port=0 there's not much we can do because we don't know
the port number yet when the instance config is created.

Fixes gh-425

The aspectjweaver jar includes all of aspectjrt, and the former is
used at runtime in a number of places (tests fail if you remove
it). Both are not needed so we have picked one (the other one than
recommended in gh-666).

Fixes gh-666

fixes gh-591

EurekaBootStrap implements ServletContextListener which causes problems because of early instantiation.

fixes gh-664

* pull625:
  Refactor SimpleHostRoutingFilter

Removed deprecated HttpClient APIs, exposed method to override client, fixed ignoredHeaders

* multiple_monitoring:
  Enables hystrix monitoring of multiple services on a single server.

* create-httpclient-ribbon-command:
  an Apache http client zuul ribbon command

This is an implementation of a RibbonCommand and a factory which makes
use of a loadbalancing http client based on apache's http-components
http-client.
With this command/factory it is possible to route PATCH http requests
via zuul/ribbon as well.

fixes gh-412