Adding NuGet spec file
Add reference to RestApiSDK nuget package to allow sample work out of the box

https://github.com/paypal/rest-api-sdk-dotnet/issues/31
Update references in older project files
Merge branch 'addNugetPackage' of https://github.com/neilrees/rest-api-sdk-dotnet into pull39
Adding RestApiSDK 0.7.7 NuGet package
Correcting dependency path for VS2010 sample
Merge branch 'master' into stable