Replace tab to four spaces.

This commit refs #53.
Decide the # of worker processes, using Nginx functionality.

- delete attributes/default.rb
- Specify `worker_processes auto;`

This commit refs #53.
Specify the # of file descriptors, when using Nginx.

When using Nginx, do not use OS's default # of file descriptors.

This commit refs #53.
Specify the # of clients served per one worker process.

This commit refs #53.
Accept as many connections as possible.

This commit refs #53.
Use `epoll` method.

This commit refs #53.
Shorten the `keepalive_timeout` from 65 to 30.

This commit refs #53.
Tuning the cache informations.

This commit refs #53.
Allow the server to close connection on non responding client.

This commit refs #53.
Request timed out value from 60 to 10.

This commit refs #53.
If client stop responding,  free up memory -- default 60.

This commit refs #53.
Specify the min size of the files that are to be gzipped.

This commit refs #53.
Merge pull request #53 from kazu634/id/53

[nginx] nginx.confのカスタマイズを実施する