With just a bit more hackery on the Zuul request wrapper we can mask
off the input stream and content lengths, and fix them so they contain
the expected content. Doesn't work (yet) for multipart content.

Fixes gh-109

Because we were using Lifecycle to kick off the eureka registration the
local server port wasn't available yet. The change is to use an
ApplicationListener and listen for the event that contains the container
with its port instead.

Fixes gh-15