Added support to JsonDeserializer for deserializing a Dictionary to a Dictionary<String,List<T>>

[davidgrupp]

Added support to JsonDeserializer for deserializing a Dictionary to a Dictionary<String,List>

[haacked]

Mind adding a unit test for this? Also, we use the SimpleJson deserializer. So it might be good to submit a PR to this : https://github.com/facebook-csharp-sdk/simple-json so we don't have to special case it here. :)

[thoemmi]

You're only converting but not adding in the foreach loop. Therefore only the last item would be added to the dictionary.

[davidgrupp]

@haacked Yea i'll add unit test(s) for this.

@thoemmi This is a good point, however, the code does work as expected. I think instead of the foreach it just needs to take the first element of Child.Value and covert that value.

[haacked]

This is a good point, however, the code does work as expected.

Make sure your tests include a case where the value is a JsonArray with more than one element.

[davidgrupp]

Is there anything else that needs to be addressed for this PR? Are the unit test cases clear?

[haacked]

Thanks for your contribution!