Make the use of Spring Retry optional when using Feign

* Fix encoding issue in SpringEncoder for binary data

Fixes gh-1698

* Fix encoding issue in SpringEncoder for binary data

Fixes gh-1698

* Fix encoding issue in SpringEncoder for binary data

Add unit test.

Fixes gh-1698

* Refactors tests for better readability. Polishes imports. Removes hostname and port from TestRestTemplate-calls. Introduces @LocalServerPort

Adds the ability to turn off Spring Cloud Netflix making the feign instances as primary.

fixes gh-1016

Adds a check for an empty URI in updateToHttpsIfNeeded

Add the ability to provide a default ZuulFallbackProvider

Fixes gh-1414

#1203 Improve filter performance by using only one instance of AllEncompassingFormHttpMessageConverter (#1681)

Currently all errors during writing to the outputStream are ignored. So the
response is read to the end. This is a problem when the response is
infite or very long running (`hystrix.stream` for example) and results in the
socket never being closed and eating up threads (on zuul and the proxied
backend). With this commit the errors during writing are not ignored resulting
in closing the response.

fix gh-1672, support @RequestParam without a value

Also adds minimal javadoc to classes.

See gh-1435

gh-1641: Fixed instructions for configuring EurekaIntanceConfig in AWS

Fixes gh-1663

* pull1656:
  Separate adding X-ForwardedProto header

Add X-Forwarded-Proto header in Zuul PreDecorationFilter even with X-Forwarded-Host header being absent

This reverts commit 46ee0ce1.