Robin Ward 37f2d8c73c Adds more helpers for plugin authors
`add_class_method` can be used to add a class method that only
executes when the plugin is enabled.

`add_model_callback` can be used to attach a callback to an
ActiveRecord model such as `before_save` that will only execute
when the plugin is enabled.
2015-08-21 11:29:45 -04:00
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