Add repository to Results DTO + correct favers

Hi,

I have added the "repository" attribute to results dto and by the ways correct the "favers" attribute.
I also have add a test case for the "getRepository" method and add fixture.

Best regard.
Why did you changed it in https://github.com/fezfez/packagist-api/commit/c5b3636225f3e888b33bec985c3dc528b1b6dcfa#diff-9ac486b32b2bf930483197d3ac4e7693L30 in the first place?