Extra fields and dialog force

[mrj]

This PR adds birthdate, country_code, product, and follower_count fields to the info hash.

It also adds a way to force a permission dialog for cases where you want to allow the user to switch Spotify accounts. This is done by setting either

• request.env['rack.session'][:ommiauth_spotify_force_approval?] or
• flash[:ommiauth_spotify_force_approval?] (Rails apps only)

to a truthy value on the request that performs the Omniauth redirection.

The README.md file has also been revised.

[masterkain]

thanks for that, I'll prepare a release soon.