[keycloak-dev] use resteasy 2.3.7 where can

Server components should be using resteasy 2.3.7 as that aligns with EAP 6.3. I have updated our code to reflect this. The testsuite still uses Resteasy 3.0.8 though. I also still need to test the demos to make sure they run and also modify the WAR build so that it uses built in resteasy rather than bundling resteasy. -- Bill Burke JBoss, a division of Red Hat http://bill.burkecentral.com