Add Grunt license task to stamp the Normalize.css and Yahoo! licenses

This task prepends the proper licenses to the built files as the very
last step of the `default` Grunt task.

Gruntfile.js

@@ -12,12 +12,6 @@ grunt.initConfig({
 
     BUILD_COMMENT: 'THIS FILE IS GENERATED BY A BUILD SCRIPT - DO NOT EDIT!',
 
-    NORMALIZE_LICENSE: [
-        '/*! normalize.css v1.1.1 | MIT License | git.io/normalize */',
-        '/*! Copyright (c) Nicolas Gallagher and Jonathan Neal */',
-        '\n'
-    ].join('\n'),
-
     // -- Clean Config ---------------------------------------------------------
 
     clean: {
@@ -173,6 +167,41 @@ grunt.initConfig({
         }
     },
 
+    // -- License Config -------------------------------------------------------
+
+    license: {
+        normalize: {
+            options: {
+                banner: [
+                    '/*!',
+                    'normalize.css v1.1.1 | MIT License | git.io/normalize',
+                    'Copyright (c) Nicolas Gallagher and Jonathan Neal',
+                    '*/\n'
+                ].join('\n')
+            },
+
+            expand: true,
+            cwd   : 'build/',
+            src   : ['base*.css', 'forms*.css', 'tables*.css', 'kimono*.css']
+        },
+
+        yahoo: {
+            options: {
+                banner: [
+                    '/*!',
+                    'Kimono <%= pkg.version %>',
+                    'Copyright 2013 Yahoo! Inc. All rights reserved.',
+                    'Licensed under the BSD License.',
+                    'https://github.com/yui/kimono/blob/master/LICENSE.md',
+                    '*/\n'
+                ].join('\n')
+            },
+
+            expand: true,
+            src   : ['build/*.css']
+        }
+    },
+
     // -- Contextualize Config -------------------------------------------------
 
     contextualize: {
@@ -182,7 +211,7 @@ grunt.initConfig({
 
             options: {
                 prefix: '.k',
-                banner: '/* <%= BUILD_COMMENT %> */\n<%= NORMALIZE_LICENSE %>'
+                banner: '/* <%= BUILD_COMMENT %> */\n'
             }
         }
     }
@@ -202,7 +231,8 @@ grunt.registerTask('default', [
     'concat:build',
     'clean:build_res',
     'cssmin',
-    'concat:kimono'
+    'concat:kimono',
+    'license'
 ]);
 
 grunt.registerTask('import', [
@@ -223,6 +253,23 @@ grunt.registerTask('import-normalize', [
     'contextualize:normalize'
 ]);
 
+// -- License Task -------------------------------------------------------------
+
+grunt.registerMultiTask('license', 'Stamps license banners on files.', function () {
+    var options = this.options({banner: ''}),
+        banner  = grunt.template.process(options.banner),
+        tally   = 0;
+
+    this.files.forEach(function (filePair) {
+        filePair.src.forEach(function (file) {
+            grunt.file.write(file, banner + grunt.file.read(file));
+            tally += 1;
+        });
+    });
+
+    grunt.log.writeln('Stampped license on ' + String(tally).cyan + ' files.');
+});
+
 // -- Contextualize Task -------------------------------------------------------
 
 grunt.registerMultiTask('contextualize', 'Makes Contextualized CSS files.', function () {