Add Rakefile for automating minification

Rakefile

@@ -0,0 +1,21 @@
+# automates minifying jquery.isotope.js
+# from command line run:
+#     rake min COMPILER='path/to/compiler.jar'
+file compiler = ENV["COMPILER"] || '~/resources/google-closure/compiler.jar'
+js = 'jquery.isotope.js'
+min_js = 'jquery.isotope.min.js'
+
+desc "Generates #{min_js}"
+task :min => min_js
+
+file min_js => compiler do
+  puts "Minifying jquery.isotope.js..."
+  sh "java -jar #{compiler} --js #{js} --js_output_file #{min_js}"
+  # Adds header comment
+  min = File.read( min_js )
+  File.open( min_js, 'w') do |f|
+    f.write File.readlines( js )[0..5].join()
+    f.write min
+  end
+end
+

_config.yml

@@ -1,6 +1,7 @@
 name: Isotope
 permalink: /:categories/:title.html
 pygments: true
+exclude: [ Rakefile ]
 
 elements:
   - categories: [alkali, metal]