Add supervisord contrib example (readthedocs#3262)

* Add supervisord contrib example

Useful for running a development instance really quickly.

Doesn't yet support:

* ipdb/pdb, but still supports rdb
* color log output

* Revert to celery concurrency

* Updates

.gitignore

@@ -15,6 +15,7 @@
 .ropeproject/
 _build
 bower_components/
+contrib/supervisord.log
 deploy/.vagrant
 dist/*
 local_settings.py

contrib/readme.rst

@@ -0,0 +1,28 @@
+Running Read the Docs via Supervisord
+=====================================
+
+This is the easiest way to start all of the commands you'll need for development
+in an environment relatively close to the production evironment. All you need is
+``supervisord`` and ``redis-server``. Installation of ``redis-server`` is
+outside the scope of this documentation, but once installed, all you need to run
+from ``supervisord`` is::
+
+    pip install supervisord
+    cd contrib/
+    supervisord
+
+This will bring up a web instance for the dashboard, a web instance for
+documentation serving, two celery instances, and redis-server. 
+
+If you already are running redis-server, this will complain about the port
+already being in use, but will still load.
+
+Debugging
+---------
+
+To debug, set trace points like normal, with ``pdb``/``ipdb``. Then you can
+connect to the process by bringing it to the foreground::
+
+    supervisorctl fg main
+
+You'll still see logging to STDERR on the main supervisord process page.

contrib/supervisord.conf

@@ -0,0 +1,42 @@
+[supervisord]
+nodaemon = True
+directory = ../
+loglevel = error
+strip_ansi = False
+environment = PYTHONUNBUFFERED=1,READTHEDOCS_INSTANCE=readthedocs.org
+
+[inet_http_server]
+port = 127.0.0.1:9001
+username = 🍔
+password = 🍟
+
+[supervisorctl]
+username = 🍔
+password = 🍟
+
+[rpcinterface:supervisor]
+supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
+
+[program:redis]
+command = redis-server
+directory = ../
+priority = 0
+startretries = 0
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0
+
+[program:main]
+command = python manage.py runserver 8000
+directory = ../
+priority = 100
+stopasgroup = True
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0
+
+[program:celery]
+command = celery worker -A readthedocsinc -Q default,celery,web,builder -l DEBUG -c 2
+directory = ../
+priority = 100
+stopasgroup = True
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0