Implemented 'Append' mode for category product imports which doesn't delete all product links of a category.
Merge branch 'master' into develop
Added original validateRow method to Import/Entity/Product.php
[Fix] Problem with child rows being imported even though though the paren't is invalid. Fixes "Error in data structure: entity codes are mixed" in some cases.
 #128 Fix: URL key is empty
Merge branch 'master' into develop
Excludes PHPStorm .idea directory
Fix for issue #50
Removes unneeded comment
Merge pull request #129 from azambon/develop

Fix for issue 50
[Fix#29] Fixed issue with importing customers and categories when all rows are invalid.
Merge branch 'develop'