style(build): Simplified banner string concatenation

String concatenation changed to use array join.

Ref g-33

Gruntfile.js

@@ -7,17 +7,19 @@ module.exports = function(grunt) {
 	grunt.initConfig({
 		pkg: grunt.file.readJSON("package.json"),
 		gitinfo: grunt.task.run("gitinfo"),
-		banner: "/**\n" +
-			"* <%= pkg.name %>\n" +
-			"* @version <%= pkg.version %>\n" +
-			"* @SHA-1 <%= gitinfo.local.branch.current.shortSHA %><%= /(?!^master$)(^.*$)/.test(gitinfo.local.branch.current.name) && ' ('+ RegExp.$1 +')' || '' %>\n" +
-			"*\n" +
-			"* <%= pkg.author %>; <%= pkg.name %> JavaScript library\n" +
-			"* http://egjs.navercorp.com/\n" +
-			"*\n" +
-			"* Released under the <%= pkg.licenses[0].type %> license\n" +
-			"* <%= pkg.licenses[0].url %>\n" +
-			"*/\n\n",
+		banner: ["/**",
+			"* <%= pkg.name %>",
+			"* @version <%= pkg.version %>",
+			"* @SHA-1 <%= gitinfo.local.branch.current.shortSHA %>" +
+			"<%= /(?!^master$)(^.*$)/.test(gitinfo.local.branch.current.name) " +
+			"	&& ' ('+ RegExp.$1 +')' || '' %>",
+			"*",
+			"* <%= pkg.author %>; <%= pkg.name %> JavaScript library",
+			"* http://egjs.navercorp.com/",
+			"*",
+			"* Released under the <%= pkg.licenses[0].type %> license",
+			"* <%= pkg.licenses[0].url %>",
+			"*/\n"].join("\n"),
 		jshint: {
 			files: ["Gruntfile.js", "*.js", "src/**/*.js" ],
 			options: {