Removes the visual editor (and editor choice) as it has been decided to drop CKEditor and use something else.

The reason for this is: self dogfooding, as explained at http://indiewebcamp.com/selfdogfood. None of the maintainers actually use the visual editor, which means it was badly designed and coded. Everyone knows designing for the masses doesn't work, but everyone falls in that trap.

Fixes #224.
Merge branch 'master' of github.com:fdv/publify