Break up deployment docs into separate documents.

docs/deploying/others.rst

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+Other Servers
+=============
+
+There are popular servers written in Python that allow the execution of
+WSGI applications as well.  Keep in mind though that some of these servers
+were written for very specific applications and might not work as well for
+standard WSGI application such as Flask powered ones.
+
+
+Tornado
+--------
+
+`Tornado`_ is an open source version of the scalable, non-blocking web
+server and tools that power `FriendFeed`_.  Because it is non-blocking and
+uses epoll, it can handle thousands of simultaneous standing connections,
+which means it is ideal for real-time web services.  Integrating this
+service with Flask is a trivial task::
+    
+    from tornado.wsgi import WSGIContainer
+    from tornado.httpserver import HTTPServer
+    from tornado.ioloop import IOLoop
+    from yourapplication import app
+    
+    http_server = HTTPServer(WSGIContainer(app))
+    http_server.listen(5000)
+    IOLoop.instance().start()
+
+
+.. _Tornado: http://www.tornadoweb.org/
+.. _FriendFeed: http://friendfeed.com/
+
+
+Gevent
+-------
+
+`Gevent`_ is a coroutine-based Python networking library that uses
+`greenlet`_ to provide a high-level synchronous API on top of `libevent`_
+event loop::
+
+    from gevent.wsgi import WSGIServer
+    from yourapplication import app
+
+    http_server = WSGIServer(('', 5000), app)
+    http_server.serve_forever()
+
+.. _Gevent: http://www.gevent.org/
+.. _greenlet: http://codespeak.net/py/0.9.2/greenlet.html
+.. _libevent: http://monkey.org/~provos/libevent/