allow to exclude path for meta-header

|Q            |A  |
|---          |---|
|Bug Fix?     |no |
|New Feature? |yes|
|BC Breaks?   |no |
|Deprecations?|no |
|Tests Pass?  |yes|
|Fixed Tickets|   |
|License      |MIT|

This add the originally requested feature for excluding files for the `meta:header` command - #277 

Sent using [Gush](https://github.com/gushphp/gush)
yes i made the note earlier but removed it because i understood that he did it in purpose. Then I realized that it makes more sense to be below than above. I have seen some people put it right next to the line, thinking they are actually kind of documenting their code. However now i believe i am favoring this approach more than the above one. Though both approaches as long as they are close to the first declaration hold and are good.