Add script for minimize js files

Common/js/min.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+import sys
+sys.path.append('../../../build_tools/scripts')
+import base
+import os
+
+params = sys.argv[1:]
+
+file_path = params[0]
+file_path_min = file_path + ".min.js"
+
+compilation_level = "WHITESPACE_ONLY"
+#compilation_level = "SIMPLE_OPTIMIZATIONS"
+if (len(params) > 1):
+  compilation_level = params[1]
+
+base.cmd("java", ["-jar", "../../../sdkjs/build/node_modules/google-closure-compiler-java/compiler.jar", 
+                  "--compilation_level", compilation_level,
+                  "--js_output_file", file_path_min,
+                  "--js", file_path])
+
+min_content = base.readFile("../license/header.license") + base.readFile(file_path_min)
+
+base.delete_file(file_path_min)
+base.delete_file(file_path)
+
+base.writeFile(file_path, min_content)