Add http level config parameters
[#COOK-2522]

Added:
* client_body_buffer_size
* client_header_buffer_size
* client_max_body_size
* gzip_min_length
* proxy_cache_path
* uwsgi_cache_path
* upstream

Upstream is a set of subdirectives, so the pattern for gzip was followed
(it must first be set to "on" before anything else can be set) as the
closest methodology to follow.

Added Rubymine IDE files to .gitignore.
Merge branch 'base-config-options' of github.com:behemphi/nginx into base-config-options

Conflicts:
	attributes/default.rb
	templates/default/nginx.conf.erb