Easy to write to load grunt plugin.

gruntfile.js

/**
 * @fileOverview Easy to write to load grunt plugin.
 * @author Daijiro Wachi
 */

module.exports = function(grunt) {
	"use strict";

	/** @type {object} pkg */
	var pkg = grunt.file.readJSON("package.json");

	// Load Grunt Plugins
	Object.keys(pkg.devDependencies).slice(1).map(grunt.loadNpmTasks);
	
	/* Familiar Common Sight:(
	grunt.loadNpmTasks('grunt-contrib-watch');
	grunt.loadNpmTasks('grunt-contrib-jasmine');
	grunt.loadNpmTasks('grunt-contrib-concat');
	grunt.loadNpmTasks('grunt-contrib-uglify');
	grunt.loadNpmTasks('grunt-contrib-cssmin');
	grunt.loadNpmTasks('grunt-contrib-jshint');
	*/
};

/*
// e.g.) "package.json" in this Case.
{
	"devDependencies": {
		"grunt": "~0.4.1",
		"grunt-contrib-watch": "~0.2.0",
		"grunt-contrib-jasmine": "~0.4.2",
		"grunt-contrib-concat": "~0.3.0",
		"grunt-contrib-uglify": "~0.2.0",
		"grunt-contrib-cssmin": "~0.6.0",
		"grunt-contrib-jshint": "~0.5.4"
	}
}
*/