Visual Studio Express + SpecFlow

1. refer NuGet package: SpecFlow
2. copy packages\specflow.1.9.0\tools to C:\SpecFlow190Tools
3. If *.feature.cs can't be generated with "The element <ImportGroup> beneath element <Project> is unrecognized.  C:\Program Files\MSBuild\12.0\bin\Microsoft.CSharp.targets" error message, refer this to create the specflow.exe.config file. OR, modify the project file: <Project ToolVersion="12.0"... (Visual Studio 2013) -> <Project ToolVersion="4.0"... (Visual Studio 2010 / 2012).