[#313] Setup Rubocop for Ruby

[rgenchev]

Closes #313

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[mirandawang]

@rgenchev Thanks for the contribution!! Rubocop seems like it could be helpful. Can you describe more about what rules you're adding and what benefits you think they would bring? I'm wary to add too many rules that would block other people!

[rgenchev]

@rgenchev Thanks for the contribution!! Rubocop seems like it could be helpful. Can you describe more about what rules you're adding and what benefits you think they would bring? I'm wary to add too many rules that would block other people!

@mirandawang, sure. :)

I used what was discussed here: #313 (comment)

We use the default Rubocop configuration. We'll later work on 2 other PRs.

[FeminismIsAwesome]

@rgenchev hi is this still being worked on? we just did a refactor that will require rebasing (moving the Rails app to a Rails directory)

[FeminismIsAwesome]

Closing for now due to rebasing needs, can be reopened with those changes.