[CANVAS-13] Initial canvas SIS import/export rake tasks

- Working table export to csv, renaming/resorting files
- working user+enrollment export based on canvas section slug
- fix class name
- massive renaming
- populate lecture instance rake task should output some statistics
- moved models dir

- more eager lib subdirectories

- renaming for case issues

- fixing case issue

- module wrappers to resolve NameError