Merge in Visual Studio 2010 cutover work.
Merge in cutover to Visual Studio 2013, plus dependency on NTestCaseBuilder 2.4.0.0.
Remove spurious additional reference to NuGet directory in solution.
Fixed up some bugs in the graph generation (although as it happened, it was a case of two wrongs making a right - was still getting DAGs but for the wrong reasons). Also fixed a bug in the graph rooting so that the dependency chains in a generated DAG aren't forced to have the vertex ids in ascending order.
Merge changes to Graph generation example from 'main'.
Merge in changes to graph generation into NTestCaseBuilder.Samples, publish as NTestCaseBuilder 2.4.1.0.