adds a Makefile target to create scaffolding for a new feature

This makes it a bit easier to start creating a new feature.  
```
morgue:% make feature NAME=yourAwesomeNewFeature

morgue:% tree features/awesomeNewFeature                                                                                                     <skeleton ?>
features/awesomeNewFeature
|-- lib.php
|-- routes.php
`-- views
    `-- awesomeNewFeature.php

```