Let SecurityContextConcurrencyStrategy be installed as the hystrix
concurrency strategy regardless of if feign's hystrix support is installed.

fixes gh-1969

fixes gh-1795

The timeToLive and timeUnit parameters added to configure connection pool.

Fixes gh-1720

fixes gh-1956

fixes gh-1955

Fixes gh-1598

Fixes a race condition introduced in 1.3.0

fixes gh-1933

Add @Component for Feign Hystrix Fallback example in doc

Add support for Wildcard Types in Feign Client.  Fixes gh-1676

change HttpServletResponse to HttpServletRequest

polish FeignLoadBalancer, remove unused import statement

Ribbon client configuration based on Eureka is disabled if eureka.client.enabed is set to false.

Fixes gh-335

Pass config in retry handler

Update mvnw to 3.5.0

Fixes gh-1847

Upgrade Hystrix to 1.5.11 and apply fix to hystrixcommand.js

Make sure the EurekaClient bean is recreated after refresh. 

Fixes #1846.

Add X-Forwarded-Port header in Zuul