Control output of visual studio 2013 output

I have created an external library with some classes, basically my own game framework for use across many Unity projects. I have the build output going to a Libs folder inside the Assets folder in a Unity project. I went into the advanced build settings and turned the debug output off so it wouldn't output the debug database into the Libs folder. But it puts copies of the dependency .dlls. In this case its the UnityEditor and UnityEngine .dlls. Unity then throws an error, so I have to manually delete those two dlls from the Libs folder. I cannot find a way inside visual studio to stop it from writing those two dlls to the Libs folder. Does anyone know how to do this?

Thanks in advance!