Add specs to test setter methods
Add deprecation method for setter attribute
Add class variable to store deprecated attributes in a list
Add Railtie
Add DeprecatedAttribute set for deprecated attributes
update AttrDeprecated to use a Set object to prevent duplicate attributes
Add method to clear deprecated attributes from a model
Update specs
Add Deprecation Logger
Add Airbrake notifier
Add logger capability to AttrDeprecated
Update module scope for DeprecatedAttributeLogger
Allow equality comparison between DeprecatedAttributeSet
Return empty DeprecatedAttribute set instead of nil
Add Rails to Gemfile for testing