Allow scope to be defined inside the model to control what data is imported.
Allow a scope from within the ActiveRecord to be applied to #find_in_batches to provide finer control over data being imported.
Allow the scope to be defined for Rake based imports.
Add description to the Readme.
Changes API so we just define :scope rather than :import_scope.
Replace :import_scope with :scope in the rake task.
Remove the notion of import scope and just name it wast it is, the named scope.