Set up Grunt.

Very basic, all it does at the moment is compile our `.scss` files into
`.css` and `.min.css`

.gitignore

@@ -1,2 +1,3 @@
 /vendor/
-/.sass-cache/
+/.sass-cache/
+/node_modules

Gruntfile.js

@@ -0,0 +1,17 @@
+
+module.exports = function(grunt) {
+
+	grunt.initConfig({
+		pkg: grunt.file.readJSON('package.json'),
+		shell: {
+			buildSass: {
+				command: 'php tools/pre-commit-build-scss.php'
+			}
+		}
+	});
+
+	grunt.loadNpmTasks('grunt-shell');
+
+	grunt.registerTask('default', ['shell']);
+
+};

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "Jetpack",
+  "version": "3.0.0-alpha",
+  "description": "[Jetpack](http://jetpack.me/) is a WordPress plugin that supercharges your self-hosted WordPress site with the awesome cloud power of [WordPress.com](http://wordpress.com).",
+  "homepage": "http://jetpack.me",
+  "author": "Automattic",
+  "license": "GPLv2+",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/Automattic/jetpack.git"
+  },
+  "bugs": {
+    "url": "https://github.com/Automattic/jetpack/issues"
+  },
+  "devDependencies": {
+    "grunt": "^0.4.2",
+    "grunt-shell": "^0.6.4"
+  }
+}