Make it easier to register mock components from within Test suites

@RunWith(RenderingTestSuite.class)
public class IntegrationTests
{
    @RenderingTestSuite.Initialized
    public void initialize(MockingComponentManager componentManager) throws Exception
    {
        Mockery mockery = new JUnit4Mockery();

        final ModelContext modelContext = componentManager.registerMockComponent(mockery, ModelContext.class);
        mockery.checking(new Expectations() {{
            allowing(modelContext).getCurrentEntityReference();
                will(returnValue(new WikiReference("currentWiki")));
        }});
...