Add redirectUrl customization (via AuthOptions)

[mduriancik]

I've tried to implement my feature request: Optimisation for popup login #1361.

The implementation is more generic (and also simpler) and enables to customize the redirect URL (via AuthOptions) for not only authorizeWithPopUp() but also for authorize().

related issue: #1361

[FabianGosebrink]

Good PR, thanks. Can you add this to the docs as well?

[mduriancik]

Hello Fabian, I've modified the code as you'd suggested and I've added documentation. Have you other remarks, suggestions?

[FabianGosebrink]

Thank you for this effort! Merge @damienbod ?

[patrickstecker]

Great Feature! When do you plan to release it? I need this for following usecase:
A user sends a link to my app to another user, this user wants to open the link, but is not logged in. So he has to login first. But after login, he ist currently redirected to the standard redirectUrl, not to the link the other user send him.
I guess this PR might be the soloution for me.

[smallswan399]

Great Feature! When do you plan to release it? I need this for following usecase: A user sends a link to my app to another user, this user wants to open the link, but is not logged in. So he has to login first. But after login, he ist currently redirected to the standard redirectUrl, not to the link the other user send him. I guess this PR might be the soloution for me.

Did you find the solution @patrickstecker ?