Add support for different upload services - WCF, etc. Ability to use the RadUpload with a Linux server side.

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The reason is security and asynchronous implementation + remove the processing to a service instead of the silverlight app.

security: Using the filestream attribute in SQL Server 2008 the connection to the database is to be made by windows authentication. Therefor we created a functional windows account that runs the service and is responsible for the connection to the database server.
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