Fix URLs generation for "Try it" feature

[DenTray]

Open API specification allows to store app URL, so many documentation viewers implement the "Try it" feature by sending example data for the app using URL.

For the swagger viewer URL are generating incorrectly and looks like this http://localhost/auto-doc/localhost/v0.1/users

Need to find a way to fix it and test other viewers as well (rapidoc, elements)

[DenTray]

@hans-thomas thanks, works great now, released in https://github.com/RonasIT/laravel-swagger/releases/tag/3.1.3