[CANVAS-13] [CLC-1812] Initial canvas SIS import/export rake tasks

JIRA: https://jira.media.berkeley.edu/jira/browse/CLC-1812
JIRA: https://jira.media.berkeley.edu/jira/browse/CANVAS-13

- 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