Update RuboCop. Fix Minor Style Issues

Update RuboCop-todo list to new file format referenced in
[this](https://github.com/bbatsov/rubocop/issues/1050) issue.

Also fixes various minor style issues warning rubocop.

Inside RuboCop config file, fixes exclude syntax to eliminate warnings on rubocop runs.

Signed-off-by: "Jake Champlin" <jake.champlin.27@gmail.com>
Updates Gemfile to new RuboCop Version

Updates Gemfile for new RuboCop version 0.23.0

Signed-off-by: "Jake Champlin" <jake.champlin.27@gmail.com>
Merge pull request #429 from grubernaut/style_neat

Update RuboCop. Fix Minor Style Issues