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Update code and build system for .NET 4.5
Change PU1 to NET401 in conditional defines
All *.csproj will have the .NET version appended i.e. Microsoft.Activities.Extensions.NET40.csproj, Microsoft.Activities.Extensions.NET401.csproj etc.
Output paths will include the version i.e. bin\debug\NET40, bin\debug\NET401, bin\debug\NET45
Assembly configuration will include build configuration and target framework version i.e. [assembly: AssemblyConfiguration("Debug, .NET Framework v4.0.1")]
Assembly title will include the title and configuration in the file description so you can tell using Windows Explorer which version and configuration you have.