Add template option.

I needed to be able to include files with a wrapper around it - for example to have Angular templates inline:

``` html
<script type="text/ng-template" id="path/to/file.html">
    <h1>Title</h1>
    <p>Html here</p>
</script>
```

You would do:

``` javascript
includes: {
  options: {
    template: '<script type="text/ng-template" id="{{fileName}}">' + '\n' +
                  '{{file}}' + '\n' +
                  '</script>'
    }
}
```