Changed 'Example Web Service' link in README.md

Old location that the link pointed to no longer exists on the master branch of the trapperkeeper-webserver-jetty9 project.  Updated the link to point to the base directory of the Ring example in the trapperkeeper-webserver-jetty9 project.
Merge pull request #123 from cprice404/maint/master/get-service-docs

Docs for get-service fn
Mention lein template and clojars in the README
Move `testutils` docs up higher, in prep for expansion
Update testutils docs and README

* document new testutils macros
* add docs on best practices