Reacting to System.Text.Encoding package version change
Added aspnet50 target framework for configuration
- Made things assembly neutral as a result
- Only use CallContextServiceLocator on aspnet50 and aspnetcore50

#111, #26
Added missing functionality on aspnet50
Removed temp
Updating release NuGet.config
Updating dev NuGet.config
Sharing the PCL Love - enable win81 and wpa81 in shared package
Microsoft.Framework.ConfigurationModel supports these platforms but it's not useable because it depends on Microsoft.Framework.ConfigurationModel.Shared which did not support them... fixing that.