Output file names and line numbers along with selectors

[zmoazeni]

This originally came from #9 from @ahmedelgabri

Lastly, I think the output will be very helpful if it has line numbers, right now it looks like this

{.selector} AND {#selector} share 10 rules -moz-border-radius: 2px 0px 0px 2px another: rule; another-rule; ...

Maybe something like this will be better

L:20 {.selector} AND L:45 {#selector} share 10 rules -moz-border-radius: 2px 0px 0px 2px another: rule; another-rule; ...

I agree that would be helpful. If we do this we'll need to also match up "line n from file x" since we accept multiple files.