Merge pull request #108 from u0u0/master

fixed #3675, add english article for WebSocket.
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translate the article from English to Chinese
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translate the article about Value while is new data type in v3.0 from English to Chinese.
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Create zh.md

transalte the article about Map which is new data type in v3.0 from English to Chinese
Update zh.md

add link to Map<K,V> and Value type of data structure for v3.0
Merge pull request #109 from huanghws2013/master

Translate three articles for new data structure in v3.0
issue #3811, add sample code for iOS StoreKit intergation in C++ and JSB
issue #3811, document of iOS StoreKit integration in C++
issue #3811, document of iOS StoreKit integration in JSB.
fixed #3811, fix spell error.