Commits on Apr 13, 2019

1. Add --init option to rubocop command …

   This PR adds `--init` option to `rubocop` command.
   
   ```console
   % mkdir example
   % cd /tmp/example
   % rubocop --init
   Writing new .rubocop.yml to /private/tmp/example/.rubocop.yml
   % cat .rubocop.yml
   # The behavior of RuboCop can be controlled via the .rubocop.yml
   # configuration file. It makes it possible to enable/disable
   # certain cops (checks) and to alter their behavior if they accept
   # any parameters. The file can be placed either in your home
   # directory or in some project directory.
   #
   # RuboCop will start looking for the configuration file in the directory
   # where the inspected file is and continue its way up to the root directory.
   #
   # See https://github.com/rubocop-hq/rubocop/blob/master/manual/configuration.md
   % rubocop --init # A warning will occur when .rubocop.yml already exists
   .rubocop.yml already exists at /private/tmp/example/.rubocop.yml
   ```
   
   It may be good to add a simple commented examples of basic configuration in the future.
   
   First of all, this PR aims to generate .rubocop.yml which contains the following configuration URL.
   https://github.com/rubocop-hq/rubocop/blob/master/manual/configuration.md
   
   And the generated .rubocop.yml text is quoted from the above URL.

   

   koic committed Apr 13, 2019
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