Vagrant Local Development

This commit adds playbooks and files necessary to do local development
from within Vagrant.

These playbooks start with a fresh Ubuntu 12.04 machine and:
  - Install Ansible
  - Install the Tower nightly
  - Install all components to exactly mirror production, except Apache
  - Install uwsgi and nginx for local development (since Apache lacks a
working auto-reload)

This isn't entirely perfect -- in particular, developing on task code
is probably challenging until I figure out how to get celery not to
read from the install, but it is a very easy way to get 90% of the way
there very, very quickly.

awx/settings/development.py

@@ -47,6 +47,9 @@ if 'django_jenkins' in INSTALLED_APPS:
     JSHINT_CHECKED_FILES = [os.path.join(BASE_DIR, 'ui/static/js'),
                             os.path.join(BASE_DIR, 'ui/static/lib/ansible'),]
 
+# If there is an `/etc/awx/settings.py`, include it.
+include(optional('/etc/awx/settings.py'), scope=locals())
+
 # If any local_*.py files are present in awx/settings/, use them to override
 # default settings for development.  If not present, we can still run using
 # only the defaults.