Added a solution to enable testing of the Silverlight version of the ass...

...emblies

This solution uses a set of DLLs that enables NUnit tests to be run under the standard Silverlight testing framework:
references:
http://www.jeff.wilcox.name/2009/01/nunit-and-silverlight/
http://wesmcclure.tumblr.com/post/152727000

test marked with 'Explicit' attrubute were disabled cause not supported by the SL unit test framework