Drop support for Java EE 6

[rdebusscher]

• Update Maven artifacts to Java EE 7
• Use CDI 1.1 beans.xml
• remove BeanManagerProvider and BeanProvider (CDI.current().select(C.class).get() )
• Use JSF 2.2 versioned config files.

[rdebusscher]

Use MethodHandles instead of reflection (since Java 7 is now the minimal targetted version)