Update to OSGi 5 and Jetty 8 (#703).

Several 3rd-party components are updated.
Now we have a Jetty 8, that means Servlet API 3.0
And now we have Felix 4.4, that means OSGi 5

The details:

Felix HTTP Jetty 2.2.0 -> 2.3.0
    Jetty 7.6.13 -> Jetty 8.1.14
        Servlet API 2.5 -> Servlet API 3.0

Pax Runner 1.7.5 -> 1.8.6
    Felix 3.2.2 -> Felix 4.4.1
        OSGi 4.2 -> OSGi 5

Felix Configuration Admin 1.2.8 -> 1.8.0
Felix EventAdmin 1.2.12 -> 1.4.0

See #703.