Add some forwarding options to nginx and some log stuff to uwsgi

* nginx needs to add X-Forwarded-For and REMOTE_ADDR headers to get the
  IP address properly
* uwsgi now logs 400 errors and adds the REMOTE_ADDR to the log file

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

uwsgi.ini

@@ -1,5 +1,6 @@
 [uwsgi]
-logformat = %(method) %(status) %(uri) %(proto)
+logformat = %(method) %(status) %(addr) %(uri) %(proto)
+log-4xx = true
 log-5xx = true
 #uid = uwsgi
 processes = 5