configured tabs to not reset store
corrected request for product categories
added categories to rest api
Merge branch 'develop' of git://github.com/sulu-cmf/SuluProductBundle into feature/categories

Conflicts:
	Product/ProductManager.php
Merge branch 'develop' of git://github.com/sulu-cmf/SuluProductBundle into feature/categories
Merge branch 'develop' into feature/categories
fixed tests
Merge pull request #33 from sulu-cmf/feature/categories

[FEATURE] Categories