ionic 2.0.0-alpha.55 发布，更新如下：
Bug Fixes
alert: ensure keyup listener has been removed (2710e34)
build: tell gulp when finished building (60e1278)
generators: use mkdirp-no-bin (dcc20fa)
input: copy custom attrs from ion-input to native input (4cfe210)
menu: fix scrolling page w/ side menus (72699db), closes #5272
menu: only close when open on enable change (a428363)
searcher: add autocomplete="off" to native input (f47c3c3)
Features
actionsheet: disable clicking backdrop to dismiss (7686767)
alert: disable clicking backdrop to dismiss (53e014f)
Performance Improvements
cards: remove translateZ from ion-card (60fdc5c)
tabs: render tab navbar at same time of tab content (687a17b)
下载页面：2.0.0-alpha.55
ionic 是个高级的 HTML5 移动端应用框架，是个很漂亮的使用 HTML5 开发混合移动应用前端框架。