Rails 4 changes behavior of precompile not to include originals

This patch will restore rails 3 beavior and fix emoji etc under rails 4

lib/tasks/assets.rake

@@ -0,0 +1,20 @@
+task 'assets:precompile' => 'environment' do
+  # see: https://github.com/rails/sprockets-rails/issues/49
+  # a decision was made no longer to copy non-digested assets
+  # this breaks stuff like the emoji plugin. We could fix it,
+  # but its a major pain with little benefit.
+  if rails4?
+    puts "Copying non-digested versions of assets"
+    assets = Dir.glob(File.join(Rails.root, 'public/assets/**/*'))
+    regex = /(-{1}[a-z0-9]{32}*\.{1}){1}/
+    assets.each do |file|
+      next if File.directory?(file) || file !~ regex
+
+      source = file.split('/')
+      source.push(source.pop.gsub(regex, '.'))
+
+      non_digested = File.join(source)
+      FileUtils.cp(file, non_digested)
+    end
+  end
+end