Update to Turbolinks

I went ahead and did some cleanup here and updated turbolinks.

I noticed this plugin hasnt been released yet as the docs need updated but, I fixed the referer filter to work property. I also removed resources plugin as a required dependency (this works with either resources or asset-pipeline). I did add coffee asset pipeline as a development dependency for a useful means to compile the original turbolinks.js.coffee file (copied into `grails-app/assets/javascripts`) into the web-app/js folder

Simply Run:

```
grails generate-turbolinks
``` 
While working on the plugin to generate the latest copy of `web-app/js/turbolinks.js`