Allows for more fine-grained configuration of what to ignore.

Introduce ServerIntrospector.getMetadata(Server).

fixes gh-419

This reverts commit 721fdc59.

* invalid_hostname:
  Added check for invalid hostname

The exception class has to be "fixed"

You may register a serviceId with invalid URI characters (e.g.: '_'), but the URI::getHost() fails when such chars are found.

* pull734:
  fixes gh-716 adds option to decode 404s

* pull663:
  Case insensitive Content-Encoding check

Fixes a problem with a header in the response containing
content-encoding in lowercase letters. Uses HttpHeaders for case
insensitve check.

Also fixes an issue checking if a request is made for gzip content.
If headers has more than gzip (ie gzip,deflate,sdch), checks if
contains gzip instead of equals to.

Fixes gh-662

* jkschneider-metrics-gauge-deconflict:
  Deconflict GaugeService provided by Servo/Spectator integration

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