Line-wrap legend elements in IE.

IE8+ (including IE11) does not wrap the content of legend elements.

Since questions that we put into legend elements can get quite long,
the question would overflow the page in IE.

Adding display:table rule to the legend element forces the legend text
to wrap in IE, without any negative side-effects in other browsers.

See:
http://www.456bereastreet.com/archive/201210/how_to_line_wrap_text_in_legend_elements_even_in_ie
http://stackoverflow.com/questions/6133571/how-can-i-make-legend-text-wrap

remove-points-possible: Don't display the number of points on title

Link to images in edx-solutions repository.

Update and expand the README file.

Fix html display on icon click

Fix html tip display issue and an issue related to publish_event

Remove redundant ids from events

Tracking logs

assessment-rounded-percentage: Round score result in assessments

Some fixes for assessment workflow..

Fix feedback message display

display-name: Update usage of `display_name` to include upstream changes

It used to be on a separate proeperty - it's now using a real XBlock
field and its default value

Keep submit button disabled after answering in assessment.

Once a student submits an answer in assessment mode, he should not be allowed
to change it, so stop listening for changes once an answer has been submitted.

The change lister would re-enable the submit button if the student changed their
answer, which shouldn't happen in assessment mode.

Mentoring assessment mode

Add `display_name` to the Data export XBlock.

Make use of the new optional enforce_type flag

Move to use opaque keys

CSS Fixes - Additional fixes of CSS from QA

* Proper alignment when MRQ/MCQ choices span over more than one line
* Show disabled submit button upon first load
* Remove extra color from submit button
* Size of feedback title