New endpoint entity that serves customer and supplier crud actions

There was a huge change in the platform, the entity contact now exists that both serve a customer and/or a supplier. So if you need to create/edit/delete a supplier or a customer you just use the contact entity from now on.

Since customer endpoints wrapping helper is removed, this is a breaking change.

Fixed trailing issue with Guzzle

Fixed trailing issue with Guzzle

Official release

Merge pull request #1 from drakakisgeo/develop

Changes to the updated API

Beta Testing Version

Tweaking a few things, not stable just yet.