Ionic 2.0.0-beta.7发布，HTML5移动应用框架

Ionic 2.0.0-beta.7 发布了，Ionic Framework 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。

新特性：

• datetime: add ion-datetime (1e331c9)

• Input: added functionality for clear input option on ion-input (d8e2849)

• modal: add inset modal feature (a658524), closes #5423

• modal: start of inset modals (a1a594d)

• picker: add ios/md/wp picker styles (aa9a667)

• picker: init picker (d5068f8)

• platform: add a readySource as ready resolved value (f68ac8a)

• platform: cordova pause/resume events (532096b)