[documentation] stickit side-effect clears model change tracking, see backbone.trackit

[mc2]

Hi, stickit newbie.

Would have saved me hours if there was:

• note about trackit behavior using set() and thus clearing/resetting model.changed, .hasChanged(), .changedAttributes(), .previous(), and .previousAttributes() with each form element input event.
• link to backbone.trackit if your app needs to track changes between saves.

Apologies for not having time for editing the docs and sending pull request. Thank you for the plugins.

[akre54]

What specifically? The beauty of open source is this kind of change you can and should feel free to make yourself for the benefit of others. I don't have any experience with Trackit, but I'm happy to accept a PR that fixes this.