new rubrics classes

Add in new rubrics classes:
analytic
percentage
holistic
numeric
overridden

v5.3.0: Merge pull request #41 from Brightspace/rmahler/add-feedback

Add activities feedback rel

Assignment attachments rels and classes

Merge pull request #39 from Brightspace/ChrisKraljevicD2L-patch-1

US94134 Attachments rel for assignments

5.1.0 - Grade weight rel and classes

v5.1.0

Grade weights rel and classes (#38)

5.0.0 - Hybridization

Major update to make this puppy hybridized

Update rubrics classname

minor update to change the classname. currently used in PoC. We're calling it a patch thusly

Add rubrics rels and classes

Added rubric rels:
criteria: 'https://rubrics.api.brightspace.com/rels/criteria',
criteriaGroups: 'https://rubrics.api.brightspace.com/rels/criteria-groups',
levels: 'https://rubrics.api.brightspace.com/rels/levels'

and classes:
criterion: 'criterion',
criterionCell: 'criterion-cell',
criterionGroup: 'criterion-group',
description: 'description',
feedback: 'feedback',
level: 'level'

Removed course image `high` and `low` classes

These class definitions were incorrect and do not appear on data retrieved from the course image catalog. The correct classes to use are highDensity and lowDensity, which were added in v3.3.0.

Add `high-density` and `low-density`

Merge pull request #32 from Brightspace/tjiang/course-images

Add classes for course images

Add final class to grades

Merge pull request #31 from Brightspace/tjiang/final-grade

Add final class to grades