Watch also coffee script files.

Guardfile

@@ -7,7 +7,7 @@ guard :livereload, :port => "35738" do
   watch(%r{public/.+\.(css|js|html)})
   watch(%r{config/locales/.+\.yml})
   # Rails Assets Pipeline
-  watch(%r{(app|vendor)(/assets/\w+/(.+\.(css|js|html|png|jpg))).*}) { |m| "/assets/#{m[3]}" }
+  watch(%r{(app|vendor)(/assets/\w+/(.+\.(css|js|coffee|html|png|jpg))).*}) { |m| "/assets/#{m[3]}" }
   watch(%r{(app|vendor)(/assets/\w+/(.+)\.(scss))}) { |m| "/assets/#{m[3]}.css" }
   watch(%r{(app|vendor)(/assets/\w+/(.+)\.(svg))}) { |m| "/assets/#{m[3]}.svg" }
 end