[GitHub] [incubator-weex] lucky-chen opened pull request #1618: [WEEX-642][iOS] fix wxpageRatio not report && report createInstaceContext failed info

[GitHub]

- fix wxPageRatio not report  
- add instanceId to weexContext ,if fucn `createInstanceContext` failure ，then 
we will know which instance has problem

[ Full content available at: https://github.com/apache/incubator-weex/pull/1618 
]
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