Add optimize-js to build toolchain

script/optimize-js.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+var fs = require('fs');
+var optimizeJs = require('optimize-js');
+
+var core = fs.readFileSync('build/core.js', 'utf-8');
+core = optimizeJs(core);
+fs.writeFileSync('build/core.js', core);