feature/cxf-certificates

Implementation of authentication classes based on certificates for CXF clients.

Pull request includes certificates authentication using JAVA keystores and trustores. The InternalCXFClientProvider has been modified in order to include this information in the generated JAX-RS client.
Looking at the samples in java doc [1], it looks like the FileInputStream must be explicitly closed after loading.
[1] http://docs.oracle.com/javase/7/docs/api/java/security/KeyStore.html