add gunicorn configuration file

requirements.txt

@@ -12,3 +12,4 @@ python-dateutil>=2.4.2
 python-dotenv>=0.3.0
 python-gnupg>=0.3.8
 pytz>=2015.7
+gunicorn==19.6.0

scripts/gunicorn.conf

@@ -0,0 +1,48 @@
+bind = '127.0.0.1:8000'
+backlog = 2048
+workers = 1
+worker_class = 'sync'
+worker_connections = 1000
+timeout = 20
+keepalive = 2
+spew = False
+daemon = False
+pidfile = None
+umask = 0
+user = None
+group = None
+tmp_upload_dir = None
+loglevel = 'info'
+errorlog = '-'
+accesslog = '-'
+proc_name = None
+
+def pre_fork(server, worker):
+    pass
+
+def pre_exec(server):
+    server.log.info("Forked child, re-executing.")
+
+def when_ready(server):
+    server.log.info("Server is ready. Spawning workers")
+
+def worker_int(worker):
+    worker.log.info("worker received INT or QUIT signal")
+
+    ## get traceback info
+    import threading, sys, traceback
+    id2name = dict([(th.ident, th.name) for th in threading.enumerate()])
+    code = []
+    for threadId, stack in sys._current_frames().items():
+        code.append("\n# Thread: %s(%d)" % (id2name.get(threadId,""),
+            threadId))
+        for filename, lineno, name, line in traceback.extract_stack(stack):
+            code.append('File: "%s", line %d, in %s' % (filename,
+                lineno, name))
+            if line:
+                code.append("  %s" % (line.strip()))
+    worker.log.debug("\n".join(code))
+
+def worker_abort(worker):
+    worker.log.info("worker received SIGABRT signal")
+