added attribute normalizers for experimenter and categories (slugs == tags)
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# On branch feature/experiment
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#	modified:   app/models/category.rb
#	modified:   app/models/experiment.rb
#	modified:   app/models/experimenter.rb
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text is changed on experiment page: assigned, participated. Also on the subject pool page: button - assign subjects and label: never participated before
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# On branch ppod-fixes
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#	modified:   app/views/experiments/_subject_pool.html.slim
#	modified:   app/views/profiles/_form.html.slim
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Sociology added to majors