add a new task to remove console.log

tasks/remove-logging.js

@@ -0,0 +1,27 @@
+/**
+ * remove console.log for distribution files.
+ */
+
+var groundskeeper = require('groundskeeper');
+
+module.exports = function(grunt) {
+
+  grunt.registerMultiTask('remove-logging', 'remove console.log for distribution files', function() {
+    this.files.forEach(function(file) {
+      file.src.filter(function(filepath) {
+        if(!grunt.file.exists(filepath)) {
+          grunt.log.warn('Source file "' + filepath + '" not found.');
+          return false;
+        } else {
+          return true;
+        }
+      })
+        .map(function(filepath) {
+          var content = grunt.file.read(filepath);
+          var cleaner = groundskeeper();
+          cleaner.write(content);
+          grunt.file.write(file.dest, cleaner.toString());
+        })
+    })
+  })
+};