Move require up above helper and vendor script references.  

Allows for specifying require config files in the helpers. 

```
jasmine: {
  src: 'app',
  options: {
    helpers: [
      'app/config.js'
    ],
    specs: ['spec/out/*_spec.js'],
    template: require('grunt-template-jasmine-requirejs')
  }
}
```