Rollout to predefined groups
ActiveRecord::Rollout#match?
Add index to ActiveRecord::Rollout::Flag#percentage_type
ActiveRecord::Rollout::OptOut class
ActiveRecord::Rollout::Flaggable#rollout?
ActiveRecord::Rollout::Flaggable#rollout? can be given a block
Exceptions raised in rollout blocks increment failure_count of rollout
ActiveRecord 3-friendly finders
Move version out of gem spec require

This is a compromise until I find another solution. I want ActiveRecord::Rollout to be an ActiveRecord::Base, but also be the top-level namespace. This doesn't appear to possible without not requiring ActiveRecord::Rollout in the gem spec at all.
Namespacing fix by introducing ActiveRecord::Rollout::Feature
Configuration generator
Allow digits and underscores in define_{klass}_group
Fix versioning and specs
Convert group name to string before comparing to defined group names
Remove useless match_{klass}? (leave match_instance?)
gemspec and README updates