Optionally support DataContract in Mono/Unity#61

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Esam-Bustaty wants to merge 6 commits intofacebook-csharp-sdk:masterfrom

Esam-Bustaty:master

Commits on May 15, 2014

Commits on May 18, 2014

Commits on May 20, 2014

New constructor for DataMember and fixed scopes
Esam-Bustaty
committed