Fixes whitespace in .nuspec description.
Ignores NuGet packages.
Incremented to version v4.2.3.
Fix Error Logging
Fixes bad logic that reports expired tokens incorrectly.
Merge remote-tracking branch 'origin/v4.1' into v4.1
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.
Fixes exception thrown from unusual language-culture combinations in OpenID Sreg responses.  Closes #261.
Merge branch 'v4.1' into v4.2

Conflicts:
	src/DotNetOpenAuth.Core/Messaging/MessagingUtilities.cs
Merge branch 'v4.2' into v4.3
Merge remote-tracking branch 'origin/v4.2' into v4.2
Merge branch 'v4.1' into v4.2
Merge branch 'v4.2' into v4.3

Conflicts:
	src/version.txt
Use only web safe characters in client state arg

Fixes #268
Fixes compile error on .NET 3.5
Merge branch 'v4.1' into v4.2
Merge branch 'v4.2' into v4.3
Removes CTP version marker from v4.3 branch