Make the directory for the processed files

_plugins/minimagick.rb

@@ -1,4 +1,5 @@
 require "mini_magick"
+require "fileutils"
 
 module Jekyll
   module MiniMagick
@@ -20,6 +21,8 @@ module Jekyll
         return write_path
       end
 
+      FileUtils.mkpath("_site/#{dest_path}")
+
       image = ::MiniMagick::Image.open("_pictures/#{image_path}")
 
       image.combine_options do |i|
@@ -29,8 +32,6 @@ module Jekyll
         i.strip
       end
 
-      puts write_path
-
       image.write "_site/#{write_path}"
 
       write_path