Automatically assign an id attribute to headings, if it is not set already

[caffodian]

Automatically make headings linkable by assigning them an id, if one doesn't exist already.

Some similar implementations elsewhere do this by also automatically create <section> tags but this probably isn more trouble than it's worth.

[caffodian]

One possible thing to explore would be to see if this could be done with a htmlparser filter:

http://stackoverflow.com/questions/7836349/force-ckeditor-to-add-a-class-to-p-tags

Some questions with this approach:

• I'm not sure if this would work when elements are just created
• i'm not sure if this will apply when switching the styles of existing html

[caffodian]

Other possibility to explore: http://docs.ckeditor.com/#!/api/CKEDITOR.editor-event-insertElement the insertElement event?