replaced encounterTasksFinished with encounterTaskScoring

scoring in the browser is still broken (problem loading gauss library)
scoring works for parallel-line-length
turn on offline scoring of line-orientation and perpendicular-line-length
added UI stuff to toggle scores
factored out score-formatting logic
show scoring on tasks page
Merge pull request #144 from davidmarin/task-scoring

Show scores in "tasks" interface