Change UserphraseModel::add to public slot
Change UserphraseModel::importUserphrase to public slot
Change UserphraseModel::exportUserphrase to public slot
Change remove to public slot
Merge branch 'feature/slot'

* feature/slot:
  Change remove to public slot
  Change UserphraseModel::exportUserphrase to public slot
  Change UserphraseModel::importUserphrase to public slot
  Change UserphraseModel::add to public slot

Closed #41