update sample html
fix typos
fix table width not handling colspan correctly
fix table layout issues (https://htmlrenderer.codeplex.com/workitem/9016)
fix box content min/max width calculation
fix div height with overflow: hidden
fix column width layout with columns with set width
fix padding not respected on line wrap
fix RTL text support
update version to 1.4.7.0
use default unit for line-height
update test sample html