recursive in-place Uglify

Gruntfile.js

module.exports = function(grunt) {
	var uglify = {
		options: {
			files: function(srcDir) {
				var filesAry = [];
				var results = {};
				filesAry.push(srcDir);
				filesAry = grunt.file.expand(filesAry);
				filesAry.forEach(function(file) {
					results[file] = [file];
				});
				return results;
			},
		}
	};

	// Project configuration.
	grunt.initConfig({
		pkg: grunt.file.readJSON('package.json'),
		uglify: {
			options: {
				mangle: {
					except: ['Zepto', 'jQuery', 'Backbone']
				},
				banner: '/*! <%= pkg.name %> - v<%= pkg.version %> - ' + '<%= grunt.template.today("yyyy-mm-dd") %> */',
			},
			my_target: {
				files: uglify.options.files('scripts/**/*.js')
			}
		}
	});

	grunt.loadNpmTasks('grunt-contrib-uglify');
	// Default task(s).

	grunt.registerTask('default', ['uglify']);

};