Allow versioning by not forcing absolute path for graph requests

[frausto]

Faraday assumes leading slashes are absolute paths, this prevents you from being able to set your version based on the :site. for example when site is "https://graph.facebook.com/v2.2"

lostisland/faraday#293

[simi]

@frausto what about https://github.com/mkdynamic/omniauth-facebook/blob/master/lib/omniauth/strategies/facebook.rb#L19 ?

[frausto]

@simi Good catch. That was also having the same issue, I took out the leading slash but am still seeing it strip out the v2.2 when it makes the token request. I'll look into it further later on

[matteogiacobazzi]

Also in the image_url method https://github.com/mkdynamic/omniauth-facebook/blob/master/lib/omniauth/strategies/facebook.rb#L188 you can't make versioned request. What about passing the version number in client_options?

[simi]

@matteogiacobazzi see https://github.com/mkdynamic/omniauth-facebook#api-version. I think that should be enough, we just need to ensure it is used everywhere.

[frausto]

Alright I think we covered all the scenarios now where versioning was being affected

[simi]

Awesome @frausto! Thanks for your contribution.

[simi]

Changelog note added in 9c93c08.

[simi]

Released in 2.0.1!