Add support for @Docker annotation on one test

[vdemeester]

Something like

@Test
@Docker(…)
public void myTest() {
    // […]
}

[FaustXVI]

Is it closed by #94 or do we still want to allow annotations per tests (with multiple annotations it could be useful…)

[vdemeester]

Not close by #94, we still want to be able to add a @Docker annotation on one test.