Update uwsgi/nginx deployment documentation

Instead of using the uwsgi_modifier1 30 directive, the uwsgi docs
recommend to use the mount / manage-script-name approch which mounts
a module + callable to a certain path. This way, SCRIPT_NAME and
PATH_INFO are correctly rewritten.

See http://uwsgi-docs.readthedocs.org/en/latest/Nginx.html#hosting-multiple-apps-in-the-same-process-aka-managing-script-name-and-path-info

Fixes #1464

docs/deploying/uwsgi.rst

@@ -29,36 +29,40 @@ Given a flask application in myapp.py, use the following command:
 
 .. sourcecode:: text
 
-    $ uwsgi -s /tmp/uwsgi.sock --module myapp --callable app
+    $ uwsgi -s /tmp/uwsgi.sock --manage-script-name --mount /yourapplication=myapp:app
 
 Or, if you prefer:
 
 .. sourcecode:: text
 
-    $ uwsgi -s /tmp/uwsgi.sock -w myapp:app
+    $ uwsgi -s /tmp/uwsgi.sock --manage-script-name --mount /yourapplication=myapp:app
+
+The ``--manage-script-name`` will move the handling of ``SCRIPT_NAME`` to
+uwsgi, since its smarter about that. It is used together with the ``--mount``
+directive which will make requests to ``/yourapplication`` be directed to
+``myapp:app``, where ``myapp`` refers to the name of the file of your flask
+application (without extension). ``app`` is the callable inside of your
+application (usually the line reads ``app = Flask(__name__)``.
 
 Configuring nginx
 -----------------
 
-A basic flask uWSGI configuration for nginx looks like this::
+A basic flask nginx configuration looks like this::
 
     location = /yourapplication { rewrite ^ /yourapplication/; }
     location /yourapplication { try_files $uri @yourapplication; }
     location @yourapplication {
       include uwsgi_params;
-      uwsgi_param SCRIPT_NAME /yourapplication;
+      uwsgi_pass unix:/tmp/yourapplication.sock;
-      uwsgi_modifier1 30;
-      uwsgi_pass unix:/tmp/uwsgi.sock;
     }
 
 This configuration binds the application to ``/yourapplication``.  If you want
-to have it in the URL root it's a bit simpler because you don't have to tell
+to have it in the URL root its a bit simpler::
-it the WSGI ``SCRIPT_NAME`` or set the uwsgi modifier to make use of it::
 
     location / { try_files $uri @yourapplication; }
     location @yourapplication {
         include uwsgi_params;
-        uwsgi_pass unix:/tmp/uwsgi.sock;
+        uwsgi_pass unix:/tmp/yourapplication.sock;
     }
 
 .. _nginx: http://nginx.org/