Add after_login_lock callback

[y-yagi]

This patch added a callback that execute only when user locked. This callback useful for run something actions(e.g. send notifications to admin) when user locked.

Please ensure your pull request includes the following:

• Description of changes
• Update to CHANGELOG.md with short description and link to pull request
• Changes have related RSpec tests that ensure functionality does not break

[y-yagi]

Any feedback?

[joshbuker]

@y-yagi Thanks Yagi, I'll get this into v1. Are there any other callbacks that you've found yourself wishing Sorcery provided?

[y-yagi]

Thanks for the reply! This is the only callback that we need.