Integrate proof of concept gulpfile into Django project

 - Changes the Django `static` and `media` directories to be inside `/var/www/nyc-trees/`
 - Adds the `static` template filter for converting static file to use their versioned path
 - Fixes a few issues with the proof of concept `gulpfile`
I don't think this is doing anything to prevent the `node-sass` issue because `HOME` is already set when `sudo_user: nyc-trees` is used:

**Test**:

```yaml
- command: "env"
  sudo_user: nyc-trees
  register: xyz

- debug: msg="{{ xyz }}"
```

**Test output**:

```
TASK: [nyc-trees.app | debug msg="{{ xyz }}"] *********************************
ok: [app] => {
    "msg": "{u'changed': True, u'end': u'2014-11-30 16:20:57.370450', u'stdout': u'SUDO_GID=1000\\nMAIL=/var/mail/nyc-trees\\nUSER=nyc-trees\\nHOME=/var/lib/nyc-trees\\nLC_CTYPE=en_US.UTF-8\\nSUDO_UID=1000\\nLOGNAME=nyc-trees\\nTERM=xterm-256color\\nUSERNAME=nyc-trees\\nPATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\\nLANG=en_US.UTF-8\\nSUDO_COMMAND=/bin/sh -c echo SUDO-SUCCESS-cgccxvhleooqcfzeasiyxwbzxqdkaxgk; LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 /usr/bin/python /tmp/ansible-tmp-1417364457.06-82328742011746/command\\nSHELL=/bin/bash\\nSUDO_USER=vagrant\\nPWD=/home/vagrant', u'cmd': [u'env'], u'rc': 0, u'start': u'2014-11-30 16:20:57.362994', u'stderr': u'', u'delta': u'0:00:00.007456', 'invocation': {'module_name': u'command', 'module_args': u'env'}, 'stdout_lines': [u'SUDO_GID=1000', u'MAIL=/var/mail/nyc-trees', u'USER=nyc-trees', u'HOME=/var/lib/nyc-trees', u'LC_CTYPE=en_US.UTF-8', u'SUDO_UID=1000', u'LOGNAME=nyc-trees', u'TERM=xterm-256color', u'USERNAME=nyc-trees', u'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin', u'LANG=en_US.UTF-8', u'SUDO_COMMAND=/bin/sh -c echo SUDO-SUCCESS-cgccxvhleooqcfzeasiyxwbzxqdkaxgk; LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 /usr/bin/python /tmp/ansible-tmp-1417364457.06-82328742011746/command', u'SHELL=/bin/bash', u'SUDO_USER=vagrant', u'PWD=/home/vagrant']}"
}
```