Added Rakefile that builds minified runtime using Google Closure Compiler API.

.hgignore

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+syntax: glob
+
+lib/*.min.js

Rakefile

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+require "net/http"
+require "uri"
+
+version = File.read("VERSION").strip
+
+file "lib/runtime-#{version}.min.js" => "lib/runtime.js" do |t|
+  response = Net::HTTP.post_form(
+    URI.parse("http://closure-compiler.appspot.com/compile"),
+    {
+      "js_code"           => File.read(t.prerequisites.first),
+      "compilation_level" => "SIMPLE_OPTIMIZATIONS",
+      "output_format"     => "text",
+      "output_info"       => "compiled_code"
+    }
+  )
+
+  if response.code != "200"
+    abort "Error calling Google Closure Compiler API: #{response.message}"
+  end
+
+  File.open(t.name, "w") { |f| f.write(response.body) }
+end
+
+task :default => "lib/runtime-#{version}.min.js"