Ability to automatically generate migration when site setting is changed from trust level to groups.
Example usage:
rails generate site_setting_move_to_groups_migration min_trust_to_create_topic create_topic_allowed_groups
Ability to automatically generate migration when site setting name is changed.
Example usage: `rails generate site_setting_rename_migration site_description contact_email`
Jarek Radosz
Martin Brennan
Krzysztof Kotlarek