Create cookbook for installing `growthforecast`.

This commit refs #70.
Install `rrdtool` package.

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Make a system user for running `growthforecast`.

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Install `perlbrew` script.

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Install `Perl` in `growthforecast` user's home directory.

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Install `cpanm` in the `growthforecast`'s home directory.

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Install `growthforecast`.

This commit refs #70.
Make directories for `growthforecast`.

- Add data directory
- Add log directory

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Enable and start `growthforecast` service.

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Modify `growthforecast.rb` to pass `foodcritic`'s test.

This commit refs #70
Add tests for growthforecast.

This commit refs #70.
Change `gen_data` task to test properly.

This commit refs #70.
Modify tests to reflect the `GrowthForecast`'s spec.

This commit refs #70.
Merge pull request #70 from kazu634/id/70

GrowthForecastをインストールする