fix #1533 syntax highlighting of markdown links
add emmet demo
force measure sizes if container is visible but width is 0
use snipetManager for expanding emmet snippets
fix $# and %# highlighting in perl mode
Merge branch 'origin/master' into misc

Conflicts:
	lib/ace/virtual_renderer.js
small cleanup
Merge pull request #1539 from ajaxorg/misc

fix several small bugs