Merge pull request litehtml#285 from litehtml/flex_layout

Flex layout

fix: render_test._/"acid1.htm" test fails on x86 architecture

Issue litehtml#265

get_child_by_point: search child from the end of elements list

Merge pull request litehtml#203 from stasoid/master

fix list index overflow

Fixed parsing CSS at-rules

Closes litehtml#74

readme file update