Add support for django-statsd

This changeset adds django-statsd support and middleware integration in
all environments. The middleware automatically emits metrics for model
interactions, HTTP response codes, and view rendering timers. Additional
metrics can be emitted via:

  from django_statsd.clients import statsd

  # Increments the "something_interesting" counter by 1
  statsd.incr('something_interesting')

Metrics flow through:

  Django (app) -> Statsite (services) -> Graphite (services)

Attempts to resolve #16.
Add monitoring variables for test environment

The test provisioning path does not include monitoring since #52, but
when monitoring specific attributes are not set, they render as:

{# statsite_host #}

This breaks client attempts at DNS resolution.

This changeset populates valid monitoring specific attributes so that
attempts at DNS resolution don't fail.
Bump pgweb version to 0.1.1

See also: https://github.com/azavea/ansible-pgweb/pull/1
Add vagrant port mapping section to README

A quick cheat sheet to help know how services are mapped.
Add fields to User model

* Privacy flags (fixes #58)
* `is_minor` (fixes #56)
* Opt-in flags (needed for profile page)
Merge branch 'feature/hmc/django-statsd' into develop
Make `apps/users/views' a package

View files grow and grow. For now separate into `user.py` and `group.py`.
User profile page basics
Ignore migrations when running `flake8`
Merge pull request #94 from RickMohr/user-profile-basics

User profile basics
Fix pgweb Upstart start on stanza

There are no shared folders on the `services` virtual machine, so using
`vagrant-mounted` isn't a great option.
Merge branch 'feature/hmc/bump-pgweb' into develop
Use decorators from django-tinsel
Replace is_logged_in with builtin Django decorator
Adjust static asset handling by Nginx to accommodate Django

This changeset alters the way static assets are served by Nginx. Static
assets emitted by Django and prefixed with `/static/` are handled by a
specific `location` block that creates an alias to
`{{ app_home }}/collected_static`.

Attempts to resolve #78.
Merge branch 'feature/hmc/nginx-static' into develop
Merge branch 'feature/hmc/pgweb-upstart' into develop
Merge pull request #96 from maurizi/fix-decorators

Switch to using decorators libraries
Switch back to console based emails for development

Fixes #99

Since debugserver.sh gives console output, this is probably a better
development experience than file-based emails anyways
Merge pull request #100 from maurizi/console-email

Switch back to console based emails for development