Remove need for jax-rs-api.jar

The Eclipse Orbit repository (http://download.eclipse.org/tools/orbit/downloads/drops/R20110523182458/repository/) contains the JAX-RS API bundled as a plugin, so we could probably remove the jars I've put in the org.jboss.tools.ws.jaxrs projects' /lib folder and just add a dependency on that plugin, which would reduce the SVN size.

On the other side, it would add an external dependency that devs should grab to avoid compilation errors, and it may have an impact on the build chain (have to confirm that with Nick Boldt)

WDYT ?