Fixes whitespace in .nuspec description.
Ignores NuGet packages.
Fixes bad logic that reports expired tokens incorrectly.
Adds Content-Length header to direct responses.
A possible fix for exception in ClaimsResponse.Culture, if Language + Country doesn't make a valid culture.
https://github.com/DotNetOpenAuth/DotNetOpenAuth/issues/260

Just a simple try-catch. According to this comment at SO http://stackoverflow.com/a/12375100 using try-catch is the fastest is you don't expect a continuous stream of illegal combinations.
StyleCop and comment touch-ups.
Use only web safe characters in client state arg

Fixes #268
Fixes compile error on .NET 3.5