Don't bundle extra dependencies

[a14m]

In the gemfile (https://github.com/NoamB/sorcery/blob/master/sorcery.gemspec#L21-L22)
oauth and oauth2 (and they both have a lot of dependencies bundled with them) are bundled with every install although they are not needed all the time...

Can we remove these dependencies and mention bundling them in the readme if a user wanted to have the external modules supported ? or better, automatically appending them to the gemfile (if they are not there) when generating the submodule migration ?

if this is required, I can add a PR (on my free time) to address this
inspired by https://www.mikeperham.com/2016/02/09/kill-your-dependencies/

[arnvald]

Hey @mad-raz

I think it's a good idea. If you can submit a PR for that, it'd be great.

[Ch4s3]

This would be great for the next release @mad-raz.