jquery-tabby is never used

If used, .tabby() should be called on some jquery expression,
but 'tabby' substring is never to be found in the code.

Maybe it was used in past, but now CodeMirror takes care of Tab fine.
Merge branch 'master' into tabby-out
Merge branch 'master' into tabby-out

Conflicts:
	config.js
Merge branch 'master' into tabby-out
Merge pull request #1047 from herby/tabby-out

jquery-tabby is never used