before we merge this in, could you change this line to:

```js
assemble.options.plugins = grunt.file.expand(assemble.options.plugins).map(function(plugin) {
  return require(path.join(process.cwd(), plugin));
}) || [];
```
so that in the grunt config, users would be able to do this:

```js
plugins: ['./test/plugins/*.js']
```

then I think we're good to merge it. thanks again!