Add Gruntfile to configure minifying

Adresses #219

Author: mischah

Gruntfile.js

@@ -0,0 +1,46 @@
+'use strict';
+
+module.exports = function(grunt) {
+
+	// Get devDependencies
+	require('load-grunt-tasks')(grunt, {scope: 'devDependencies'});
+
+	// Displays the execution time of grunt tasks
+	require('time-grunt')(grunt);
+
+	// Config
+	grunt.initConfig({
+		pkg: grunt.file.readJSON('package.json'),
+
+		// uglify
+		uglify: {
+			options: {
+				sourceMap: true,
+				compress: {
+					drop_console: true,
+					drop_debugger: true
+				},
+				banner: '/* <%= pkg.title %> - v<%= pkg.version %>\n' +
+						' * Copyright ©<%= grunt.template.today("yyyy") %> Mathias Bynens\n' +
+						' * <%= grunt.template.today("yyyy-mm-dd") %>\n' +
+						' */'
+			},
+			minify : {
+				files: {
+					'jquery.placeholder.min.js': ['jquery.placeholder.js']
+				}
+			}
+		}
+
+	});
+
+	/**
+	 * Register own tasks by putting together existing ones
+	 */
+
+	// Default task
+	grunt.registerTask('default',
+		['uglify']
+	);
+
+};