Add rubocop to check the style of the codebase

[nodo]

What do you think about adding rubocop (http://rubocop.readthedocs.io/en/latest/) to check the style of the codebase?

It doesn't necessarily mean that we need to agree with all the rules enforced by rubocop. However, I find useful to have a consistent style in the codebase after we agree on which rules to use.

I would suggest to add some basic configuration and the run rubocop --auto-gen-config. This will generate a .rubocop_todo.yml which tracks the offences. Then we could gradually fix them.

WDYT?

[mattwynne]

Agreed, great idea. It will also present great opportunities for first timers contributions to correct the style violations.

[lock]

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