(TK-80) Update dependencies/use webrouting service

This PR does three things. First, it updates all the dependencies in the generated template to the latest versions. Second, it changes the template to use `clj-http-client` instead of `clj-http`. Third, it changes the template to use the webrouting service instead of the webserver service.
Can you move the jetty dep up into the main production deps as part of this PR?  We like to keep it in the dev profile for our stuff so that we have flexibility in which version of Jetty we drop in when we build an uberjar, but I don't think that pattern will be very obvious to folks who are using the template.  (In fact, someone opened an issue about this on Jira a while back; we should see if we can find it so that we can mark it as closed when this PR gets merged).