added Gruntfile

Gruntfile.coffee

@@ -0,0 +1,21 @@
+module.exports = (grunt) ->
+
+  # Project configuration.
+  grunt.initConfig
+    pkg: grunt.file.readJSON 'package.json'
+
+    coffee:
+      tasks:
+        src: 'coffee/tasks/**/*.coffee'
+        dest: 'tasks'
+        # grunt expects npm modules to have a top-level tasks directory, in js
+
+    watch:
+      files: 'coffee/**/*.coffee'
+      tasks: 'coffee'
+
+  # Load tasks
+  grunt.loadNpmTasks 'grunt-coffee'
+
+  # Register tasks
+  grunt.registerTask 'default', ['coffee']