Servlet spec upgrade:
        <servlet.version>3.1-b05</servlet.version>
        <jstl.version>1.2</jstl.version>
        <jsp.version>2.3.0</jsp.version>                        
        <jsf.version>2.1.2</jsf.version>
        <el.version>2.2.1-b04</el.version>        
Fix web.xml dtd validation