#NOB-12 (C-02) : Issue fixed. Added a 'subCategories' readonly field.
#NOB-12 (C-02) : When GETting /categories only the root categories should be returned
#NOB-12 (C-02) : When GETting /categories?name=<name_filter> all categories matching the name (like) will be returned
#NOB-12 (C-02) : Support also as a subresource - When GETting .../categories?name=<name_filter> all categories matching the name (like) will be returned.
#NOB-12 (C-02) : Support also as a subresource - When GETting .../categories?name=<name_filter> all categories matching the name (like) will be returned.