Add Catalog Category Product Relation importer
Update Readme for catalog_category_product import
Removed unnecessary constants
Bugfix for partial indexing because $this->importSource(); resets the _data array
Removed debug 8-)
Bugfix. Sometimes categories will be cleaned in each iteration and therefore losing its previous relations
Merge pull request #96 from Zookal/catalog_category_product

[FEATURE] Catalog category product Import