Merge pull request #100 from ArtyomKazak/master

Info string changes the `class` attribute of the `code` tag, not `pre`.
Use generic 'change' to trigger parseAndRender.

Modifies #98.
Dingus:  use bind('keyup paste cut mouseup'...

Modifies #98.  (Generic 'change' by itself wasn't enough.)
Merge branch 'master' of https://github.com/ArtyomKazak/stmd