[IronPython] Unused files

[Sanghyeon Seo]

Please consider removing following unused files from the repository so
that they don't appear in the source code download.

Microsoft.Scripting/Ast/TryFinallyStatement.cs
Microsoft.Scripting/CheckedDictionaryEnumerator.cs
Microsoft.Scripting/DictionaryUnionEnumerator.cs
Microsoft.Scripting/Publisher.cs
Microsoft.Scripting/Utils.cs
Microsoft.Scripting/WeakHash.cs

I know, they are already removed from the project file, but some
people (including myself) prefer to use filesystem rather than XML
file for the view of the project.

-- 
Seo Sanghyeon