Pedal

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* Fixed bug with Full Feedback Resolver not sorting feedback by priority
* GradeScope resolver now allows custom messages (pre-alpha)
* GradeScope resolver now supports leaderboard

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* GradeScope environment has hidden unit tests
* unit_test can now take in an assertion function
* Suppressed TIFA warning message for unknown modules
* Fixed bug with error messages not rendering correctly in runtime errors

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* Pedal now supports loading IPYNB files directly
* NBGrader Environment can filter IPYNB cells
* Sandbox's open function will now respect Submission files better
* Online tests will now respect requirements_dev.txt
* GradeScope environment now outputs all Used feedback
* Fixed assert_group label in unit_test
* Bug fix for CAIT in classes

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* New environment: NBGrader (prototype)
* New hook for adding feedback to reports
* New Pedal logo (not yet integrated)
* New silent resolver
* New tracing mode for Sandbox that can track functions
* Remove dependency on Coverage module

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* Fixes for Sandbox's block/allow function mocking
* Fixing up GradeScope environment
* Feedback's field serialization can now be overridden

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* Add missing __index__ method to SandboxResult
* Fix SandboxResult's __int__ to return an integer