gfsh question

[Jianxia Chen]

Does gfsh support PUT with user defined class? For example, if I have a
Parent class, and I do the following:

```
put --key=10 --key-class=java.math.BigInteger --value-class=demo.entity.Parent
--value=('id':10, 'name':'jun', 'income':123) --region=/Parent
```

which gives the following error:

```
Message : Error in converting JSON Couldn't convert JSON to Object of type
class java.math.BigInteger
Result  : false
```

Thanks,
Jianxia