Revert "Added nunit.exe to debug unit test"

This reverts commit 9559a8baddd38dd5bf9b706e1c2970deee8eb405.
Revert "Fixed nunit.core.dll reference locations."

This reverts commit 9029ba1288023227dbd0e259f6c0d362cd14a8fa.
Revert "fixed the documentation to refer to test case instead of theory."

This reverts commit 52a179be4cecbb46b2a026971dc477a5051e8a1a.
Revert "Remove xcopy of the libraries."

This reverts commit 9d013ce89ad5e392ea387d6834b35329de0461b6.
Revert "Removed AutoFixture.NUnit.Addin and AutoFixture.NUnit.Addin.UnitTest projects"

This reverts commit 9f5bafebdec23a87c65f9f6d0724afcab84f9eb0.
Revert "Moved AutoFixture.NUnit.Addin to AutoFixture.NUnit"

This reverts commit 567a1f0ffa004a96b62da186ce29b6bdd908cd35.
Revert "Moved AutoFixture.NUnit.Addin.UnitTest to AutoFixture.NUnit.UnitTest"

This reverts commit a1322528c265bcbd09d3957e8dc42f75f5e22126.
Removed unnecessary references.
Fixed documentation.
Moved AutoFixture.NUnit.Addin -> AutoFixture.NUnit
Fixed AutoFixture.NUnit.UnitTest to use nunit.exe to debug scenario tests