Add auto-fixing to newline-before-return

Following @alberto’s suit. If accepted, I’d like to implement this. I’ll table this for now in favor of JSCS compatibility issues. If anyone else is interested in picking this up, please feel free.

Some interesting challenges I found while doing some initial work on this:

• Keeping indentation (Not sure if necessary, given multi-pass auto-fixing, but seems like a nice thing to have)
• If there’s a comment between the return statement and the previous token, I think that the newline should come after the previous token (but before the comment), as this seemed to me to be the more often used case. This shouldn’t be the behavior if the comment is on the same line as the previous token, though (in which case the newline should probably come after the comment).

Alternatively, if we feel like making those decisions is overreaching for a stylistic rule like this, then we can just not auto-fix if there are comments between the return statement and the previous token.

[vitorbal]

Quick update: I’ll probably have a PR for this by the weekend!

[vitorbal]

Okay, agreed. Thanks for the input everyone! I will work on this most likely during the weekend.