Update docs regarding manually uploading files
Merge pull request #200 from jcroll/patch-1

[RFC] Doc update: Make Product getters and setters explicit
Inital commit to support thephpleague/flysystem.
Add support for Flysystem storage
Merge pull request #221 from K-Phoen/flysystem

Support Flysystem
Give access to the property mapping object to the namers