Hystrix fallback support for Zuul routes.

Fixes gh-250.

Document Manual Feign Client Creation

Breaks Spring Boot 1.3 compatibility, enables 1.5

Moving eureka.server.{expectedNumberOfRenewsPerMin,defaultOpenForTrafficCount} to eureka.instance.registry so relaxed binding can be used. Default to old values for backwards compatibility.

This reverts commit 90d6490f.

Signed-off-by: Gregor Zurowski <gregor@zurowski.org>

* pull1339:
  Support DELETE method body for SimpleHostRoutingFilter

fixes gh-1329

Saves about 5MB in the final executable jar, and it should be
optional for Spring Cloud users.

#1376 Register and cancel event sending fix

Upgrade zuul 1.3.0

Fixes gh-1374

* pull1370:
  Warning for GC Overhead Limit Reached with servo.

Fixes gh-947

Secure ribbon urls were forced to use https scheme via UriComponentsBuilder, that was created from original uri. This transformation url encoded previously encoded url parts that were used to create builder. This was introduced in c883495f.

This change fixes double url encoding using RibbonUtils.updateToHttpsIfNeeded that fixes double escaping case and corner case with '+' in url as well.

Fixes gh-1382

Remove @Autowired from FeignClientFactoryBean

This reverts commit 99b86e7a.

@Autowired causes NullPointerExceptions because of some unknown lifecycle issues.

fixes gh-1366

Previously, parameter names with colons (ie foo:bar), caused an IllegalArgumentException because 41c36400 introduced UriTemplate to properly encode.

fixes gh-1193

Adds `@FeignClient.fallbackFactory` to define a `feign.hystrix.FallbackFactory`.

fixes gh-1117

* add config option to not ignore security headers
* fix field documentation of ignoreSecurityHeaders
* add documenation for  zuul.ignoreSecurityHeaders

fixes gh-1096

Helps with the confusion seen in #1365

RibbonUtils now replace the encoded space character '+' in the query string in favor of the equivalent '%20' when rewriting the URI in https. This is due to UriComponentsBuilder verifying the allowed characters in the encoded URI when building to the URI java.net class. The '+' is considered illegal but is widely used in the field. (#1367)