fixes gh-881

See gh-896

fixes gh-897

Fixes gh-891

8.15 version of Feign breaks VND content types

fixes gh-886

fixes gh-882

fixes gh-880

I'm not sure that is a good thing though.

Fixes gh-873

For compatiblity with Angel streams we only need to set the content
type explicitly.

Fixes gh-873

Consistent with Spring MVC (and untested up to now apparently).

Fixes gh-874

Fixes gh-872

i.e. user sends multiple files with the same parameter name.

Fixes gh-870

fixes gh-731

fixes gh-695

fixes gh-542

fixes gh-857

Upgrade RxJava to 1.1.1

fixes gh-866

fixes gh-859

fixes gh-530

By default we now discard all Set-Cookie and Cookie headers. User
can manipulate it per route via zuul.routes.*.sensitiveHeaders, or
globally via zuul.ignoredHeaders.

fixes gh-854

fixes gh-847