Added platform-specific assemblies and started unit tests
Unit test and fixes for RDF import/export under PCL
Integration tests for ExecuteTransaction and Query

A couple of simple unit tests to ensure that the basic functionality of
ExecuteTransaction and Query methods of IBrightstarService are working
as expected in a Windows Store App environment.
Removed obsolete directory
Added project for Windows Phone integration tests
Updated solution to enable NuGet package restore.
Updated PCL build to support EntityFramework

This update requires a narrower PCL targetting. The portable version of
BrightstarDB now targets .NET 4.5, Silverlight 5, Windows Phone 8 and
Windows Store Apps.
Updates to run core unit tests under PCL
Added Windows Store integration tests
Fixed hint path for VDS.Common in desktop tests
Merge branch 'feature/pcl' into develop