Merge pull request madskristensen#1942 from gentoo90/ko

HTML: Add <!-- ko --> virtual element outlining

CSS: Fixed issue with scroll bars

Updates to AppVeyor

Fixed node-sass compiler

Merge pull request madskristensen#1580 from am11/master

we-node-server: Fixes syntax error

Merge pull request madskristensen#1378 from am11/master

CodeGen: Entertain empty classes (madskristensen#1377)

v2.3