add loading
Merge branch 'master' of https://github.com/RubyLouvre/avalon.oniui.git
Merge branch 'master' of https://github.com/RubyLouvre/avalon.oniui.git
add loading spin effect
Merge branch 'master' of https://github.com/RubyLouvre/avalon.oniui.git
Merge pull request #180 from gogoyqj/master

可配置颜色