Make a fresh clone of the repo build without need for nuget.exe download/configuration.

Remove import of Microsoft.Bcl.Build.targets from GrantTool and ExampleMemberList projects because they aren't available when the solution first loads and caused a project load failure due to updated nuget behavior.
Edit nuget.targets file to force download of the nuget.exe file if it doesn't exist.
Ignore the nuget.exe file itself so that it does not get committed.
Remove non-existent nuget.config file from solution file.
Remove nuget.exe from the solution file since it doesn't exist when first cloned and there's no value in having it in the solution.
Update service pack level for the solution file to 12.0.3.