Bump version of Node.js role

Attempts to resolve #41.
Wire up the database

This changeset connects the Django application (running on `app`) to the
PostgreSQL database (running on `services`). The Django application is
setup to pull database settings in from the environment and `envdir` is
used to populate the environment.

Example usage:

```bash
$ vagrant ssh app
vagrant@app:~$ envdir /etc/nyc-trees.d/env /opt/app/manage.py runserver
```

Attempts to resolve the following issues:

- https://github.com/azavea/nyc-trees/issues/28
- https://github.com/azavea/nyc-trees/issues/31
- https://github.com/azavea/nyc-trees/issues/35
- https://github.com/azavea/nyc-trees/issues/36
Set up CRLF handling for Windows clients
Create Django apps with models, URLs, and view stubs

* Keep `core` app small (with no UI, and just the ubiquitous User and Group models)
* Create topic-specific apps for handling groups of models and the URLs that service them
* Name all URLs (usually the view name)
* Create view stubs for all URLs and import where referenced
* Create stubs for decorators and import where referenced
* Add apps to `settings.LOCAL_APPS`
* Distribute all models from `doc/draft-models.py` and all URLs from `doc/draft-urls.py`