Implementing NYT's ICE track changes to Open Ended Assessements

[caesar2164]

@VikParuchuri, could you give this PR a look?

• Added boolean to OE problem CMS settings to turn on ICE track changes
• Added ICE init and tracking start/stop to HTML
• Conditional in Peer Grading HTML for ICE container
• CSS styling for ICE container and insertion/deletion elements
• Added class to track changes HTML
• Added ice.min.js as well as included it in the js requirements for peer grading
• Use track_changes in peer_grading_problem
• (@jrbl) Refactor peer_grading_problem to lookup track_changes variable by problem location.
• (@jrbl) Whitelist ICE insert, delete tags
• (@jrbl) Adds ICE multi-user-editor insert and delete tags to the peer grading sanitize_html whitelist.
• add reset button

[caesar2164]

Adds the boolean to CMS

[VikParuchuri]

Do we want any "Caution: this is experimental!" caveats?

[VikParuchuri]

High level: I really like this idea, and it could be a significant value add.

[VikParuchuri]

How is this displayed to students in the combinedopenended module? Do we need any css to style it properly?

Never mind, I see the css. Do you have any screenshots so we can know if we need to change any HTML around?

[VikParuchuri]

Can't this just be included in peer_grading_problem.js as a function and conditionally called? This does not really tie in with our javascript workflow.

You could also just bundle it into a file and have the peer grading xmodule load it.

[jbau]

New .coffee file for what used to be in the <script> tag in peer_grading_problem.html