Revert "added Bespin editor (on focus) to textareas"

This reverts commit 7a012059d74a5b383e424c682fa89eb93490fa04.

May return to this idea (media-type-based sub-sections of
the JSON doc), but not with Bespin as it has been discontinued
and was huge for what we needed anyhow.
HTML5 validity fix; dropped JSON2 & jquery.json
fixed a JS yntax error; improved #input JSON Ajaxing
fixed add/another button
:retab-ed to use spaces; Yeah VIM!
s/textile/markdown and i :heart: open source
Merge branch 'master' into gh-pages