Use pkg.homepage

Created by: zlatanvasovic

I changed hardcoded site url to pkg.homepage. Althrought, I ran grunt dist.

/cc @mdo

Gruntfile.js

@@ -11,7 +11,7 @@ module.exports = function(grunt) {
     // Metadata.
     pkg: grunt.file.readJSON('package.json'),
     banner: '/*!\n' +
-              ' * Bootstrap v<%= pkg.version %> (http://getbootstrap.com)\n' +
+              ' * Bootstrap v<%= pkg.version %> (<%= pkg.homepage %>)\n' +
               ' * Copyright <%= grunt.template.today("yyyy") %> <%= pkg.author %>\n' +
               ' * Licensed under <%= _.pluck(pkg.licenses, "url").join(", ") %>\n' +
               ' */\n\n',