JBIDE-10207 Add support for JAX-RS Providers

Adding support for JAX-RS Providers lifecycle, including validation

Fixing NPE
update parent pom version to 4.1.0.Alpha2
Fixing parent version in pom.xml: moving to 4.1.0.Alpha2
Merge branch 'master' of github.com:xcoulon/jbosstools-webservices