Canvaslms

- Adds option to print login ID for submissions
- Adds formatted rubric data to single submission output

**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v1.13...v1.15

Fixes minor bugs.

**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v1.11...v1.13

What's Changed
* Refactors grades summary modules, adds disjunctive maximum by dbosk in https://github.com/dbosk/canvaslms/pull/63


**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v1.10...v1.11

Updates what attributes are printed by the `submissions` command. We now print
both submission and grading dates. We no longer print the Canvas ID.

Adds the `results` subcommand to export results from a course.

Bugfix for assignments filtering