Added product creation
Merge branch 'master' of https://github.com/thelia/thelia

Conflicts:
	core/lib/Thelia/Model/Product.php
Merge branch 'master' of https://github.com/thelia/thelia

Conflicts:
	core/lib/Thelia/Controller/Admin/ProductController.php
	core/lib/Thelia/Model/Product.php
Fixed some unit tests