[#73271124]add 'progress-bar'
fix conflict in merge with master
tweak progress-bar.html
Merge branch 'master' into 73271124progress-bar
fix conflict in merge with master
[#73271142]cherry-pick 'helper classes' related commits

get umerged files which is related "helper classes" pattern

- liquid/_includes/components/helper-classes.html
- scss/_helper-classes.scss
minify some css
Merge pull request #47 from gengo/73271124progress-bar

[#73271124]  'progress-bar' and 'helper clasess'
Travis build 208