[WEEX-46] add some component features and bugfixes

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Done
• Affects Version/s: 0.14
• Fix Version/s: 0.14
• Component/s: Web Renderer
• Labels: features
• Assignee: S. Wei Zheng
• Reporter: Danz He
• Due: 16/Jun/17
• Created: 16/Jun/17 04:07
• Updated: 21/Jun/17 07:09
• Resolved: 21/Jun/17 07:09

Description

Hi, I add some more features to h5-render 2.0, including:

• support `position: sticky` in list / scroller's direct children.
• use `resetLoadmore` method to enable list / scroller to be able to trigger loadmore event again.
• set alignment for children of loading / refresh to `center` by default in both x and y axis.
• add `waterfall` component.

and also fix several bugs:

• fix triggering duplicate appear / disappear event.
• hide scroll bar by default.

pull request : https://github.com/apache/incubator-weex/pull/438

Issue Links

• links to: GitHub Pull Request #438