delete more excel stuff

schedules/db/seeds-excel.rb

-require_relative 'excel_loader'
-
-# Deletes all records from the database.
-Closure.delete_all
-CourseSection.delete_all
-Course.delete_all
-Semester.delete_all
-
-loader = ExcelLoader.new 'db/data/fall2018.xlsx'
-
-loader.load_data

schedules/test/models/excel_loader_test.rb

-require 'test_helper'
-load 'db/excel_loader.rb'
-
-class ExcelLoaderTest < ActiveSupport::TestCase
-  # NUMBER_ADDED_BY_FIXTURES = 2
-  # test 'loads data correctly' do
-  #   loader = ExcelLoader.new 'db/data/testdata.xlsx'
-  #   loader.load_data
-
-  #   assert(Semester.count > NUMBER_ADDED_BY_FIXTURES, 'No semester loaded')
-  #   assert(Course.count > NUMBER_ADDED_BY_FIXTURES, 'No courses loaded')
-  #   assert(CourseSection.count > NUMBER_ADDED_BY_FIXTURES, 'No sections loaded')
-  # end
-end