* feign-parameter-processors:
  Feign annotated parameter processors

For extensibility by connectors

We have to ensure that the ZuulController is not mapped on a
forward otherwise we just go back through the same code
path and render nothing.

Adds support for feign-hystrix

fixes gh-606

fixes gh-600

see https://github.com/Netflix/Hystrix/pull/927

User can provide a url in the route that starts with "forward:"
(instead of "http:" etc.) to handle the request locally.

Also properly ignores ignored routes, so they can be handled locally
(rather than giving up and sending 404).

Fixes gh-536

* pull588:
  Add isDebugEnabled() check

It is good thing to make this checks because of expensive concatenation of String objects (debug messages).

fixes gh-596

fixes gh-591

fixes gh-527

Helps when eureka is on the classpath, but is explicitly disabled.

fixes gh-521

Move it back to EurekaDiscoveryClientConfiguration.

fixes gh-578

Since all feign clients now have access to the type, logging can apply a type regardless.

Fixes gh-431

fixes gh-447

Eureka now only directly depends on java.inject.

Fixes gh-529

* pull585:
  Fix feign scanning that fails if clients attr is not use

fixes gh-584

fixes gh-570

fixes gh-576

* feign-compression-docs:
  Feign compression documentation

* pull577:
  Use instanceof for better readability

* pull575:
  Use "<>" and use isInfoEnabled