added VS 2012 solution file
changed platform target of projects to AnyCPU
changed Release and Production build configurations to not define Debug constant and to optimize code
fixed issue with Helper classes in test projects to use LocalPath instead of AbsolutePath property because the old one was doing character escaping (space - to %20 and so on)
reformatted code a bit
removed not used libraries from `libs` folder
added NUnit nuget package
fixed Setty.Host to return error code in case of error
added settings dictionary wrapper for MvcRazor engine and added functionality to throw a custom exception if a setting key is missing
fixed SettingsReader to ignore folders with project files
removed .core.config and .setty.config from Setty.Test.Project and created .setty file instead to point to relative directory
removed functionality from Setty.csproj to copy dlls to and to create .setty.config file in Setty.Test.Project because it's completely redundant since that project uses ilmerged setty.exe, which was manually copied there some time ago by someone