ubc / ubcpi / 478

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travis-ci

Delete learner's state in staff debug

- implement the callback clear_student_state
- add a new submission to indicate existing answers are deleted
- add (but commented out) code to partially support revising score
manually.  But full support will require adding logic to persist the
score within xblock
- fix issue with same explanation displayed multiple times in Step 2
- simplify the Simple algo for picking sample explanation.  Instead of
using arbitrary max loop count of 100 and hope to pick unique explanations,
remove item from the pool once they are chosen.

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