Allow return with multiple return values

[chriseppstein]

https://github.com/nex3/sass/blob/master/test/rubocop_extensions.rb

The RedundantReturn cop doesn't allow you to specify a return statement as the last line. But if the point is to return several values, I think return a, b, reads better than [a, b]

[bbatsov]

I'm on it!

[aelor]

+1