Simple CDI runner for tests

With this runner, we can inject stuff inside tests annotated with `@RunWith(WeldJunitRunner.class)`
just like I did on `CDIBasedContainerTest`:
```Java
@RunWith(WeldJunitRunner.class)
public class CDIBasedContainerTest extends GenericContainerTest {
  
 @Inject private CDIBasedContainer cdiBasedContainer;
 @Inject private CDIProvider cdiProvider;
 @Inject private Contexts contexts;
```