NuGet packages have been updated.
Revert "NuGet packages have been updated."

This reverts commit 783c5781dc28cd23b91e3102899a8b1d9b439a23.
Merge upstream into the fork.
1) Projects have been updated up to .Net Framework 4.5;
2) NuGet packages have been organized in more efficient way.
Merge pull request #8 from Metanga/master

Merge recent changes to the public repository.