Add v4 readme, licensing and NuGet changes
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Upgrade all projects to .NET 4.0
Add latest Contributor Michael Hanney
Change version from "4" to "4.0" to make NuGet happy
Remove unused extensions in SS.Common.Extensions
Update sln
Move all Extensions to root of project
skip trying to build SL5 until refactor is done
Remove all SL5 builds until refactor is done
re-sync MvcHtmlString impl after runtime errors dynamically generating a class
Update SS.Redis to use re-factored Common Extensions
Change Evaluator to reference .NET 4.0 System.Core.dll
Use shared Env.ReferenceAssembyPath for finding path to Reference Assemblies
Move HTTP Extensions and ContentType/MimeTypes to SS.Text
Move Url Extensions to SS.Text HTTP Utils
Remove .NET 3+ Concurrent Collection shims
Add ToRelativeUri alias to match with ToAbsoluteUri
Update ReadLines() generator extension
Remove all 'where T : class, new()' constraints where possible and remove any legacy/unused classes along the way.