RudeBuild version 1.4 has been released. This release adds support for Visual Studio 2013 and 2015 (community and professional editions). Additionally, the solution settings dialog got revamped. It now shows all C/C++ files that are part of the solution in a tree view, sorted by project and using the same folders as solution explorer. Each C/C++ file in the tree has a checkbox that is used to determine if the file should be included or excluded from the unity build.
You can download the latest installer from the SourceForge project page located here https://sourceforge.net/projects/rudebuild/files/