add ruleId to formatter output

Making it write output like this:

```
timers.js: line 483, col 2, Warning - Expected a conditional expression and instead saw an assignment. (no-cond-assign) 
tls.js: line 82, col 9, Warning - Wrap the /regexp/ literal in parens to disambiguate the slash operator. (wrap-regex) 
```

Note ruleId in parens at the end of the strings. Yes, it makes strings even longer, I know that.

Rationale:
It's needed to find an offending rule quickly. Without this I would've grepped the ruleset trying to find out which rule is writing a certain message, and it ain't very nice.