Install `nginx`.

This commit #71.
Modify `/etc/init.d/growthforecast` to place `nginx` in front of `GrowthForecast`.

This commit refs #71.
Deploy the `nginx` configuration file for `GrowthForecast`.

This commit refs #71.
Add test for installing `nginx`.

This commit refs #71.
Modify test for the init script for `GrowthForecast`.

This commit refs #71.
Add test for nginx configuration file.

This commit refs #71.
Modify md5 checksum to be its true check sum.

This commit refs #71.
Merge pull request #71 from kazu634/id/71

GrowthForecastのフロントにNginxを設置する