Add support for Rubocop

[celeduc]

Reports on violations of the Ruby Style Guide.

https://github.com/bbatsov/rubocop

[loz]

Doesn't the already supported cane do much the same thing? Or is this more specific?

[celeduc]

This is waaaaaaay pickier. Fudge got 250+ warnings.

[loz]

not sure if that's a good thing ;)

250 sounds very picky, the fudge code base is in pretty good shape..

[loz]

I get: 45 files inspected, 647 offences detected

[celeduc]

We can stick with cane for existing projects, but this might be good for things starting out.

Not a high priority, obvs.

[bbatsov]

Keep in mind that RuboCop is pretty configurable, so if you don't think that some of the problems it reports is worth it - just disable the relevant check.

[chrisbarber86]

Fixed by #108