Add defaults to all directives in nginx.conf

The reason most of these are changed is already covered by the existing
doc block

closes #127

nginx.conf

@@ -2,42 +2,52 @@
 # http://nginx.org/en/docs/dirindex.html
 
 # Run as a unique, less privileged user for security reasons.
+# Default: nobody nobody
 user www www;
 
 # Sets the worker threads to the number of CPU cores available in the system for best performance.
 # Should be > the number of CPU cores.
 # Maximum number of connections = worker_processes * worker_connections
+# Default: 1
 worker_processes auto;
 
 # Maximum number of open files per worker process.
 # Should be > worker_connections.
+# Default: no limit
 worker_rlimit_nofile 8192;
 
 events {
   # If you need more connections than this, you start optimizing your OS.
   # That's probably the point at which you hire people who are smarter than you as this is *a lot* of requests.
   # Should be < worker_rlimit_nofile.
+  # Default: 512
   worker_connections 8000;
 }
 
 # Log errors and warnings to this file
 # This is only used when you don't override it on a server{} level
+# Default: logs/error.log error
 error_log  logs/error.log warn;
 
 # The file storing the process ID of the main process
+# Default: nginx.pid
 pid        /var/run/nginx.pid;
 
 http {
 
   # Hide nginx version information.
+  # Default: on
   server_tokens off;
 
   # Specify MIME types for files.
   include       mime.types;
+
+  # Default: text/plain
   default_type  application/octet-stream;
 
   # Update charset_types to match updated mime.types.
   # text/html is always included by charset module.
+  # Default: text/html text/xml text/plain text/vnd.wap.wml application/javascript application/rss+xml
   charset_types
     text/css
     text/plain
@@ -54,11 +64,13 @@ http {
 
   # Log access to this file
   # This is only used when you don't override it on a server{} level
+  # Default: logs/access.log combined
   access_log logs/access.log main;
 
   # How long to allow each connection to stay idle.
   # Longer values are better for each individual client, particularly for SSL,
   # but means that worker connections are tied up longer.
+  # Default: 75s
   keepalive_timeout 20s;
 
   # Speed up file transfers by using sendfile() to copy directly
@@ -66,37 +78,45 @@ http {
   # For performance reasons, on FreeBSD systems w/ ZFS
   # this option should be disabled as ZFS's ARC caches
   # frequently used files in RAM by default.
+  # Default: off
   sendfile        on;
 
   # Don't send out partial frames; this increases throughput
   # since TCP frames are filled up before being sent out.
+  # Default: off
   tcp_nopush      on;
 
   # Enable gzip compression.
+  # Default: off
   gzip on;
 
   # Compression level (1-9).
   # 5 is a perfect compromise between size and CPU usage, offering about
   # 75% reduction for most ASCII files (almost identical to level 9).
+  # Default: 1
   gzip_comp_level    5;
 
   # Don't compress anything that's already small and unlikely to shrink much
   # if at all (the default is 20 bytes, which is bad as that usually leads to
   # larger files after gzipping).
+  # Default: 20
   gzip_min_length    256;
 
   # Compress data even for clients that are connecting to us via proxies,
   # identified by the "Via" header (required for CloudFront).
+  # Default: off
   gzip_proxied       any;
 
   # Tell proxies to cache both the gzipped and regular version of a resource
   # whenever the client's Accept-Encoding capabilities header varies;
   # Avoids the issue where a non-gzip capable client (which is extremely rare
   # today) would display gibberish if their proxy gave them the gzipped version.
+  # Default: off
   gzip_vary          on;
 
   # Compress all output labeled with one of the following MIME-types.
   # text/html is always compressed by gzip module.
+  # Default: text/html
   gzip_types
     application/atom+xml
     application/javascript