added support for responseClass=List[com.foo.Bar]

Wrt issue #47 

Added support for 

```java
@ApiOperation(value = "XX", notes="YY", responseClass="List[com.foo.Bar]")
```
and retain support for 
```java
@ApiOperation(value = "XX", notes="YY", responseClass="com.foo.Bar", multiValueResponse=true)
```