Be able to create a test as a client

It would be good to easily create a test case run as client with a `--runAsClient` parameter or something like that. So the command:

```
arquillian-create-test --value src/main/java/org/MyClass.java --runAsClient
```

You will endup will the following code

```
@RunWith(Arquillian.class)
@RunAsClient
public class AuthorEndpointTest
{
    ...
}
```
