Allow Rails 4
Allow later power_enums
Add basic rails compatibility for has_one_current

Note: This gem currently makes it impossible to use the has_*(name,
scope, conditions) interface as it alters the interface in
alias_attribute.
Update interfaces so we don't lose info
Task 229 fixed tracked behavior for rails 4, removed deprecated code
Fixed scope for has_one_current
Allow scope passing to has_one_current
Scopes merging
Be more liberal on power_enum requirement
Arel way for scope checking fo has_one_current
Merge pull request #1 from HornsAndHooves/rails_4

Rails 4