remove .project folder in root that prevents easy import in eclipse
JBIDE-12690 No JAX-RS problems when importing a project that contains errors

Preventing some NPE
Taking care of having the metamodel build command inserted *before* the validation command
Keeping the validation context in the JAX-RS Metamodel (via the ValidationContextTree) to hold
the context between validation calls.
JBIDE-15031 - JAX-RS Metamodel builder called too many times during project build

Do not launch a build job when the metamodel already exist and is being initialized.