wip
it no longer catches on fire
got sprint 3 to add a reading task directly through task plans and an assistant
two steps in the study task, empty homework tasks
exercises now in task list
cleanup of exercise json, removed debuggers
oops forgot this
removed _json from content_json
incrementing fake IDs in fake exercise data
actually using biglearn
some minor code refactoring, wrote new factories, cleaned up all but one pesky existing spec (aside from the sprint 3 spec which doesn't run automatically)
some new specs
fixes from PR 23 code review
spec fixes
Merge pull request #23 from openstax/sprint-3-jp-1

WIP Assistant / TaskPlans / Sprint 3