add jsbin embedded support
Merge pull request #359 from jcouyang/patch-1

add jsbin embedded plugin
Closes #360: non-ascii heading id generation
Escape special characters in headings' IDs
Merge remote-tracking branch 'origin/patch-1'

Conflicts:
	lib/parse/renderer.js

Signed-off-by: Or'el Ben-Ya'ir <orelbenyair@gmail.com>