Merge branch 'dev'
Merge branch 'master' of https://github.com/facebook-csharp-sdk/facebook-csharp-sdk
Merge branch 'master' of https://github.com/facebook-csharp-sdk/facebook-csharp-sdk
Merge pull request #306 from sanjeevdwivedi/master

Fixed issue when query parameter may not have a value
updated nuget icon url
updated version to v6.7.0
updating the nuspec file to use more compact universal notation. Also changed the Universal binary to include signing and exposing internals to Facebook.Client
Merge branch 'master' of https://github.com/sanjeevdwivedi/facebook-csharp-sdk
Merge branch 'master' of https://github.com/facebook-csharp-sdk/facebook-csharp-sdk