Add the compact mode

Add the `compact` option which strips useless `_path` suffixes in path helper functions. It should be useful in a situations when a "Routes" object has only path functions, so instead repeat again and again 

```js 
Routes.users_path()
// it will become
Routes.users()
```
Just be sure about `(:path unless @options[:compact])`. But you can leave as is. Just need fix problem with rails 3.2.