42 resolve problems on get capabilities

[nbrinckm]

This PR solves the 2 issues:

• the problem on fetching the wps capabilities (https://github.com/riesgos/async/issues/42)
• the issue with the references (https://github.com/riesgos/async/issues/41)

It also sets sets a route for download the files in the nginx - for those links that the frontend generates.

Base of this PR is that the wps server didn't properly recognized the settings that are set in the wps init container. We here touch the web.xml of the wps - which makes the tomcat to reload the wps server configuration. With that in place we update the references in the outputs. Another important thing is to retry to connect to the wps server - the docker compose internal wps may not be that fast to reliver it all on the same time.

[nbrinckm]

I think the retry is maybe better done by @arnevogt in https://github.com/riesgos/async/pull/59 then I did here. Lets discuss that tomorrow.