Wrong links to nested entities

[mysiar]

Wrong routes gnerated for nested entities
generated https://api-front.geomysiar.pl/2/show/%2Fbooks%2F2
instead https://api-front.geomysiar.pl/reviews/show/%2Fbooks%2F2

[mysiar]

Fixed in #13

[mysiar]

didn't work with prefixed api

[mysiar]

fixed in #14