How to load an external PHP library (with multiple folders) in Laravel 5?

I'm working for a solution for days on how to include the PHPCrawl library into Laravel 5.

Here is the installation guide: http://ift.tt/2h8D0g8

I tried to load it from a new Namespace called Libraries but I have to add that namespace to all the files included in the library -> it crashes on abstract classes.

I also tried to add it in the composer.json, still no luck.

Can anybody provide me with a solution?

via Chebli Mohamed