NativeScript 4.0.0 发布，创建跨平台原生应用的框架

NativeScript 4.0.0 已发布，NativeScript 可以使用 Javascript，CSS, XML 创建真正的 Native 跨平台应用，支持 iOS Android 和 Windows Universal，NativeScript 可将跨平台代码翻译成目标平台的代码。

android-images: set decodeHeight/decodeWidth default values to dip (#5490) (6509efa)
animations: change throw -> trace to avoid unnecessary app crash (#5475) (fa80355)
animations: check if target is present before removing its animation (#4586) (4bd3a94)
animations: register both style’s “name” and “cssName” (#3810) (3ea7365)

navigation: Flexible Frame Composition (#48)
angular xml: Support [prop] and (tap) bindings (fdd8c9b)
frame: handle back navigation when common layout is used as a root element (#5608) (70f0112)
frame: rework frame retrieval api (#5527) (dfa70dd)
ios: fire onDisplayed event when first frame is ready to be displayed (#5344) (1c78e47)