Provide a way to specify a timeout in Rest Services

It would be nice if we can set the timeout in Rest method declarations. Something like:

``` java
@Get(value="/myresource", timeout=3000)
public Event getEvent(); 
```

or

``` java
@Get(value="/myresource")
@HttpOptions(timeout=3000)
public Event getEvent(); 
```

or

``` java
@Get(value="/myresource")
@Timeout(3000)
public Event getEvent(); 
```
