include Utils rather than calling static methods

lib/jekyll/responsive_image/block.rb

@@ -1,6 +1,8 @@
 module Jekyll
   class ResponsiveImage
     class Block < Liquid::Block
+      include ResponsiveImage::Utils
+
       def render(context)
         config = ResponsiveImage.defaults.dup
         config.merge!(context.registers[:site].config['responsive_image'])
@@ -10,7 +12,7 @@ module Jekyll
 
         resize_handler = ResizeHandler.new
         img = Magick::Image::read(attributes['path']).first
-        attributes['original'] = Utils.image_hash(attributes['path'], img.columns, img.rows)
+        attributes['original'] = image_hash(attributes['path'], img.columns, img.rows)
         attributes['resized'] = resize_handler.resize_image(img, config)
 
         partial = File.read(image_template)

lib/jekyll/responsive_image/resize_handler.rb

@@ -1,6 +1,8 @@
 module Jekyll
   class ResponsiveImage
     class ResizeHandler
+      include ResponsiveImage::Utils
+
       def resize_image(img, config)
         resized = []
 
@@ -12,7 +14,7 @@ module Jekyll
           next unless needs_resizing?(img, width)
 
           filepath = format_output_path(config['output_path_format'], img.filename, width, height)
-          resized.push(Utils.image_hash(filepath, width, height))
+          resized.push(image_hash(filepath, width, height))
 
           # Don't resize images more than once
           next if File.exists?(filepath)
@@ -33,7 +35,7 @@ module Jekyll
       end
 
       def format_output_path(format, path, width, height)
-        params = Utils.symbolize_keys(Utils.image_hash(path, width, height))
+        params = symbolize_keys(image_hash(path, width, height))
         format % params
       end
 

lib/jekyll/responsive_image/tag.rb

@@ -1,6 +1,8 @@
 module Jekyll
   class ResponsiveImage
     class Tag < Liquid::Tag
+      include ResponsiveImage::Utils
+
       def initialize(tag_name, markup, tokens)
         super
 
@@ -18,7 +20,7 @@ module Jekyll
 
         resize_handler = ResizeHandler.new
         img = Magick::Image::read(@attributes['path']).first
-        @attributes['original'] = Utils.image_hash(@attributes['path'], img.columns, img.rows)
+        @attributes['original'] = image_hash(@attributes['path'], img.columns, img.rows)
         @attributes['resized'] = resize_handler.resize_image(img, config)
 
         image_template = @attributes['template'] || config['template']

lib/jekyll/responsive_image/utils.rb

@@ -1,7 +1,7 @@
 module Jekyll
   class ResponsiveImage
-    class Utils
-      def self.symbolize_keys(hash)
+    module Utils
+      def symbolize_keys(hash)
         result = {}
         hash.each_key do |key|
           result[key.to_sym] = hash[key]
@@ -10,7 +10,7 @@ module Jekyll
       end
 
       # Build a hash containing image information
-      def self.image_hash(path, width, height)
+      def image_hash(path, width, height)
         {
           'path'      => path,
           'basename'  => File.basename(path),