Changed Geometry#to_s to include the modifier string for width-based resize geometries.

lib/paperclip/geometry.rb

@@ -65,7 +65,8 @@ module Paperclip
     def to_s
       s = ""
       s << width.to_i.to_s if width > 0
-      s << "x#{height.to_i}#{modifier}" if height > 0
+      s << "x#{height.to_i}" if height > 0
+      s << modifier.to_s
       s
     end