Added support for EmitDefaultValue in the DataMemberAttribute#73

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Lakritzator wants to merge 2 commits intofacebook-csharp-sdk:masterfrom Lakritzator:feature/EmitDefaultValue

+199-11

Commits on Apr 27, 2016

Added support for EmitDefaultValue in the DataMemberAttribute, this is important as some services don't want null (or 0 etc) values when the data is not set.
Lakritzator
committed
Added second test case to proof the normal functionality still works.
Lakritzator
committed