Clear results when answer is changed.

Tip overflow

When user submits the answers, the results (checkmarks/popups/tips/messages)
are displayed, and the submit button is disabled.
If user then changes any of the answers, the results are cleared and the
submit button re-enabled (but only if the answers pass validation).

Use StringIO instead of cStringIO to support Unicode in LightChildren

Design refresh fixes2

Some more work for a better styling

Design refresh - Adds extra fixes

Update display when answer is changed.

When the user first submits the answers, the checkmark/cross icons,
tip popups, and a message are shown to the user.

If the user changes some of the answers, the checkmarks, popups, and message
should automatically update. This is done by automatically resubmitting the answer.
Auto submission is only enabled if number of attempts is not limited (max_attempts = 0),

Mrq/mcq validators

Modified the studio edit view to work with latest changes

Fix local_resource_url usage

Allow browser resource caching in studio_view

Add display_name to mentoring_default.xml

default-weight: Change default weight value to 1

message-incomplete: Add "incomplete" message type for errors

feedback-no-max-height: Removing max-height on feedback element

Document the Nav title text and set a default display name

Added a title element

Deleted the MRQ Title in template