applying arguments when using a function reference

Wrote my Gruntfile as below because using `rework-vars` didn't work, nor did `rework.vars`. This seemed easiest.
Then the plugins failed because an empty array was being sent as the first argument. 

`fnName.apply(fnName, e)` worked great.

``` javascript
var reworkVars = require('rework-vars')
var reworkImporter = require('rework-importer')

module.exports = function(grunt) {
  grunt.initConfig({
    rework: {
      'public/css/styles.css': __dirname+'/css/styles.css',
      options: {
        use: [
          [reworkImporter],
          [reworkVars]
        ]
      }
    }
  })
}
```