ignore idea project files
* remove parameter gr_cluster_enable
* change parameter gr_cluster_servers from String to Array
add parameters for webapp cluster
make nginx proxy_read_timeout configurable

10s is a reasonable default but some may find graphite without enough IO
and thus performing slowly and in need a fix in the short term.
allow setting gunicorn's timeout parameter

might be useful for those experiencing slow response times from graphite
(say due to IO) who want to allow a little more time to respond
Merge branches 'configurable-backend-timeout' and 'configurable-gunicorn-timeout', remote-tracking branch 'upstream/master' into merged-trials-fess