* 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

Similar to @RibbonClient

fixes gh-288

https://github.com/Netflix/Hystrix/pull/921

Still a release candidate (not yet GA), but seems to work, so we'll
try and update before Spring Cloud is released again.

Fixes gh-546, fixes gh-567, fixes gh-553 (probably)

* feign-content-encoding-snapshot:
  Feign request/response gzip compression

fixes gh-561

Specifically CloudEurekaInstanceConfig where needed.

see gh-302

Other Ribbon clients in Spring Cloud use a ServerIntrospector
to check if the Server wanted to be secure. This change levels things
up (and makes the Spring Feign Client a lit easier to customize).

See gh-414