Allowing user to dictate how a quiz behaves
By default, quizzes also redirect to self on submit. Various project requirements request quizzes to automatically redirect to the next page on submit. Use cases include pre-tests and surveys. This change adds a user-configurable properly called "show_submit_state" to allow the quiz creator to determine behavior. The attribute is True by default.

bug fix: quiz_detail.html - correcting edit url reference in breadcrumbs
flake8
on post - the absence of a checkbox property indicates "unchecked" or false. adding tests to fully demonstrate this behavior.
Merge pull request #5 from ccnmtl/show-submit-state

Show submit state