Let Nocco work in Linux (mono) environments

[stephas]

Hi dontangg,

I had to remove the nuget.exe reference from the .sln file and let the monodevelop ide resolve the dependencies in addition to the change in this pull request with respect to directory separate characters.

Works great for me! If this compiles and generates docs for you on Windows, than merge with confidence. :)

Thanks for this C# port!

[dontangg]

I'm cool with the first change that detects Linux and fixes the path. However, since part of the original point behind this was to be quick and dirty, it would probably be better using the ternary operator.

I have a hard time removing the NuGet reference because Visual Studio won't automatically find the packages, download them, etc. without it. But, I agree that it would be cool if it worked on other platforms.