[editing] Revert "Remove ContentEditableTrue" (#111)

Reverts w3c/editing#95 -- see discussion thread starting here: https://lists.w3.org/Archives/Public/public-editing-tf/2016Jan/0035.html
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/111

-- Commit Summary --

  * Revert "Remove ContentEditableTrue"

-- File Changes --

    A contentEditableTrue.html (80)
    M index.html (1)

-- Patch Links --

https://github.com/w3c/editing/pull/111.patch
https://github.com/w3c/editing/pull/111.diff

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