Migration to 2.0

[vnazarenko]

Hello, is there any other, more gracefull possibility of migration, except stop/start world. Our system is pretty large, so it's kinda difficult thing to do that

[andrewostroumov]

We discussed with @vnazarenko and concluded to prepend provider name to encrypted password. So we will have a field in the db without provider nhOG5AqEEGOlJvFmgFYv+g==\n - default mysql_aes_new and with provider active_support:WEhSRFlzV041TlV.... We will migrate whole system to new format and can process multiple providers.

[andrewostroumov]

I surprised that every time I update user model password was updated to. This makes this gem useless in production because ActiveSupport::KeyGenerator#generate_key take 100ms every time when user update. Please consider switch from serializers to native setters.