Make sure sprite sources are always processed/added in a consistent order to avoid regenerating sprite files that differ only by the order in which the sprites appear (seen when sprites are maintained by multiple users whose filesystems produce Dir globs in different orders).

Author: Ben Turner

lib/sprite/builder.rb

@@ -57,7 +57,7 @@ def build
     protected
     def write_image(image)
       results = []
-      sources = image['sources'].to_a
+      sources = image['sources'].to_a.sort
       return unless sources.length > 0
 
       name = image['name']
@@ -202,4 +202,4 @@ def path_present?(path)
       path.to_s.strip != ""
     end
   end
-end
+end