function isInitializingReducer(state = false, action) {
  switch (action.type) {
    case AUTHENTICATION_INIT_STARTED:
      return true
    case AUTHENTICATION_INIT_FINISHED:
      return false
    default:
      return state
  }
}
Reducer for isInitializing state. Changed by `AUTHENTICATION_INIT_STARTED`
and `AUTHENTICATION_INIT_FINISHED` actions.
@param  {object} [state=false] - Current isInitializing redux state
@param  {object} action - Object containing the action that was dispatched
@param  {string} action.type - Type of action that was dispatched
@returns {object} Profile state after reduction