Change vendor folder accessibility

Hello thanks for this heroku port very practical :)
When you are in debug mode for example some things have their css or image inside vendor folder and for php developper is more easy to get css and images from vendor folder.
Examples: 
* [whoops package](https://github.com/filp/whoops) look at this folder: [src/Whoops/Resources](https://github.com/filp/whoops/tree/master/src/Whoops/Resources)
* [debugbar package](https://github.com/maximebf/php-debugbar) look at this folder: [src/DebugBar/Resources](https://github.com/maximebf/php-debugbar/tree/master/src/DebugBar)

But in the current buildpack the apache config restricts access on the vendor directory so that it does not get served.

So i modified it to restrict access only on vendor/bin and vendor/heroku
Do you think it could be better for this master buildpack?