added default references and namespaces 

fixes #155, based on default console app.

DLLs:

* "System", 
* "System.Core", 
* "System.Data", 
* "System.Data.DataSetExtensions", 
* "System.Xml", 
* "System.Xml.Linq"

Namespaces:

* "System", 
* "System.Collections.Generic", 
* "System.Linq", 
* "System.Text", 
* "System.Threading.Tasks"

Once merged, I can update the samples to follow these.