Remove ConfigureAwait

Let the user decide if they want to ConfigureAwait, not the library
Adds nuget dependency on Newtonsoft.Json 5.0.4
Merge pull request #1 from arledesma/feature/RemoveConfigureAwait

Remove ConfigureAwait
Merge pull request #2 from arledesma/feature/Add_Newtonsoft.Json_nuget_dependency

Add nuget dependency on Newtonsoft.Json 5.0.4