Include `nginx.rb`.

This commit refs #73.
Install prerequisite gems.

This commit refs #73.
Deploy the configuration file for monitoring nginx logs.

This commit refs #73.
Deploy the configuration file for processing nginx logs.

This commit refs #73.
Merge pull request #73 from kazu634/id/73

[GrowthForecast] nginxのログを集約し、グラフ化する