Make things more machine independent

 * The `FSharp.Data.DbPedia.dll` file is not on NuGet, so I commented it out - but we can include it (even without the source - I'd just put it in `lib` folder in the root & include it in the GitHub repo for now)

 * I made the startup application in `fsproj` file a bit more robust, but I'm not sure how to find the location for `devenv.exe`, so I just added one more path for my machine (this is sub-optimal!)

 * I turned the CSV file locations to relative in the tests (it seems to work fine)
Use `$(DevEnvDir)\devenv.exe`. It will bring up a similar instance of VS depending on the VS version you are using. I'm using it on a C# project, but I remember it worked for F# projects as well.