generate commonjs/npm entrypoint module via grunt task

grunt/bs-commonjs-generator.js

@@ -0,0 +1,23 @@
+'use strict';
+var fs = require('fs');
+var path = require('path');
+
+var destDir = 'dist/js';
+var destFilename = 'npm.js';
+var destFilepath = path.join(destDir, destFilename);
+
+function srcPathToDestRequire(srcFilepath) {
+  var requirePath = path.relative(destDir, srcFilepath);
+  return "require('"+requirePath+"')";
+}
+
+module.exports = function generateCommonJSModule(grunt, files) {
+  var moduleOutputJs = files.map(srcPathToDestRequire).join('\n');
+  try {
+    fs.writeFileSync(destFilepath, moduleOutputJs);
+  }
+  catch (err) {
+    grunt.fail.warn(err);
+  }
+  grunt.log.writeln('File ' + destFilepath.cyan + ' created.');
+};