Add Ruby 2.4.0-preview1 to the build matrix
Add Ruby 2.4.0-preview1 to the build matrix

orientation/orientation,splicers/orientation,splicers/orientation,cmckni3/orientation,cmckni3/orientation,splicers/orientation,cmckni3/orientation,orientation/orientation,codeschool/orientation,orientation/orientation,codeschool/orientation,orientation/orientation,codeschool/orientation